Traffic Server Security Vulnerabilities and Issues — Traffic Server CVE List

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CVE•added 2019/08/13 9:15 p.m.•5670 views

CVE-2019-9513

Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.

7.8CVSS7.7AI score0.04471EPSS

CVE•added 2024/04/10 12:15 p.m.•5533 views

CVE-2024-31309

HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server. Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected. Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION fr...

7.5CVSS7.5AI score0.02807EPSS

CVE•added 2019/08/13 9:15 p.m.•5211 views

CVE-2019-9517

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the byt...

7.8CVSS7.7AI score0.04564EPSS

CVE•added 2023/10/10 2:15 p.m.•4413 views

CVE-2023-44487

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

7.5CVSS8AI score0.94434EPSS

CVE•added 2019/08/13 9:15 p.m.•3714 views

CVE-2019-9511

Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to...

7.8CVSS6.8AI score0.14268EPSS

CVE•added 2019/08/13 9:15 p.m.•2964 views

CVE-2019-9516

Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for ...

7.5CVSS7.3AI score0.02271EPSS

CVE•added 2019/08/13 9:15 p.m.•740 views

CVE-2019-9514

Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service. The attacker opens a number of streams and sends an invalid request over each stream that should solicit a stream of RST_STREAM frames from the peer. Depending on how the peer queues the RST_STR...

7.8CVSS7.9AI score0.10058EPSS

CVE•added 2019/08/13 9:15 p.m.•678 views

CVE-2019-9512

Some HTTP/2 implementations are vulnerable to ping floods, potentially leading to a denial of service. The attacker sends continual pings to an HTTP/2 peer, causing the peer to build an internal queue of responses. Depending on how efficiently this data is queued, this can consume excess CPU, memor...

7.8CVSS7.8AI score0.24189EPSS

CVE•added 2019/08/13 9:15 p.m.•509 views

CVE-2019-9518

Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends tim...

7.8CVSS7.7AI score0.03674EPSS

CVE•added 2019/08/13 9:15 p.m.•477 views

CVE-2019-9515

Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalen...

7.8CVSS7.7AI score0.04513EPSS

CVE•added 2025/04/03 9:15 a.m.•373 views

CVE-2024-53868

Apache Traffic Server allows request smuggling if chunked messages are malformed. This issue affects Apache Traffic Server: from 9.2.0 through 9.2.9, from 10.0.0 through 10.0.4. Users are recommended to upgrade to version 9.2.10 or 10.0.5, which fixes the issue.

7.5CVSS7.2AI score0.0023EPSS

CVE•added 2020/06/24 4:15 p.m.•166 views

CVE-2020-9494

Apache Traffic Server 6.0.0 to 6.2.3, 7.0.0 to 7.1.10, and 8.0.0 to 8.0.7 is vulnerable to certain types of HTTP/2 HEADERS frames that can cause the server to allocate a large amount of memory and spin the thread.

7.5CVSS6.8AI score0.00826EPSS

CVE•added 2022/03/23 2:15 p.m.•137 views

CVE-2021-44040

Improper Input Validation vulnerability in request line parsing of Apache Traffic Server allows an attacker to send invalid requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.3 and 9.0.0 to 9.1.1.

7.5CVSS7.5AI score0.00515EPSS

CVE•added 2019/10/22 4:15 p.m.•114 views

CVE-2019-10079

Apache Traffic Server is vulnerable to HTTP/2 setting flood attacks. Earlier versions of Apache Traffic Server didn't limit the number of setting frames sent from the client using the HTTP/2 protocol. Users should upgrade to Apache Traffic Server 7.1.7, 8.0.4, or later versions.

7.5CVSS7.4AI score0.05102EPSS

CVE•added 2020/04/27 10:15 p.m.•113 views

CVE-2020-9481

Apache ATS 6.0.0 to 6.2.3, 7.0.0 to 7.1.9, and 8.0.0 to 8.0.6 is vulnerable to a HTTP/2 slow read attack.

7.5CVSS7.3AI score0.05231EPSS

CVE•added 2021/05/14 9:15 p.m.•90 views

CVE-2021-27737

Apache Traffic Server 9.0.0 is vulnerable to a remote DOS attack on the experimental Slicer plugin.

7.5CVSS7.4AI score0.09467EPSS

CVE•added 2024/07/26 10:15 a.m.•79 views

CVE-2023-38522

Apache Traffic Server accepts characters that are not allowed for HTTP field names and forwards malformed requests to origin servers. This can be utilized for request smuggling and may also lead cache poisoning if the origin servers are vulnerable. This issue affects Apache Traffic Server: from 8.0...

7.5CVSS6.5AI score0.01741EPSS

CVE•added 2021/01/11 10:15 a.m.•78 views

CVE-2020-17508

The ATS ESI plugin has a memory disclosure vulnerability. If you are running the plugin please upgrade. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.

7.5CVSS7.2AI score0.02656EPSS

CVE•added 2023/10/17 7:15 a.m.•78 views

CVE-2023-39456

Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2. Users are recommended to upgrade to version 9.2.3, which fixes the issue.

7.5CVSS7.5AI score0.00578EPSS

CVE•added 2019/03/07 6:29 p.m.•77 views

CVE-2018-11783

sslheaders plugin extracts information from the client certificate and sets headers in the request based on the configuration of the plugin. The plugin doesn't strip the headers from the request in some scenarios. This problem was discovered in versions 6.0.0 to 6.0.3, 7.0.0 to 7.1.5, and 8.0.0 to ...

7.5CVSS7.2AI score0.01124EPSS

CVE•added 2023/10/17 7:15 a.m.•77 views

CVE-2023-41752

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache Traffic Server.This issue affects Apache Traffic Server: from 8.0.0 through 8.1.8, from 9.0.0 through 9.2.2. Users are recommended to upgrade to version 8.1.9 or 9.2.3, which fixes the issue.

7.5CVSS7.5AI score0.003EPSS

CVE•added 2021/06/29 12:15 p.m.•71 views

CVE-2021-32565

Invalid values in the Content-Length header sent to Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.

7.5CVSS7.5AI score0.05675EPSS

CVE•added 2021/06/30 8:15 a.m.•71 views

CVE-2021-32566

Improper Input Validation vulnerability in HTTP/2 of Apache Traffic Server allows an attacker to DOS the server. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.

7.5CVSS7.5AI score0.05998EPSS

CVE•added 2021/11/03 4:15 p.m.•71 views

CVE-2021-37147

Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.

7.5CVSS7.4AI score0.0109EPSS

CVE•added 2021/06/29 12:15 p.m.•70 views

CVE-2021-27577

Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.

7.5CVSS7.5AI score0.00682EPSS

CVE•added 2021/06/30 8:15 a.m.•70 views

CVE-2021-32567

7.5CVSS7.5AI score0.05998EPSS

CVE•added 2022/08/10 6:15 a.m.•66 views

CVE-2022-25763

Improper Input Validation vulnerability in HTTP/2 request validation of Apache Traffic Server allows an attacker to create smuggle or cache poison attacks. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.

7.5CVSS7.3AI score0.00232EPSS

CVE•added 2023/06/14 8:15 a.m.•65 views

CVE-2023-30631

Improper Input Validation vulnerability in Apache Software Foundation Apache Traffic Server. The configuration option proxy.config.http.push_method_enabled didn't function. However, by default the PUSH method is blocked in the ip_allow configuration file.This issue affects Apache Traffic Server: fr...

7.5CVSS7.3AI score0.00426EPSS

CVE•added 2018/08/29 1:29 p.m.•64 views

CVE-2018-1318

Adding method ACLs in remap.config can cause a segfault when the user makes a carefully crafted request. This affects versions Apache Traffic Server (ATS) 6.0.0 to 6.2.2 and 7.0.0 to 7.1.3. To resolve this issue users running 6.x should upgrade to 6.2.3 or later versions and 7.x users should upgrad...

7.5CVSS7.2AI score0.22115EPSS

CVE•added 2022/08/10 6:15 a.m.•64 views

CVE-2022-31778

Improper Input Validation vulnerability in handling the Transfer-Encoding header of Apache Traffic Server allows an attacker to poison the cache. This issue affects Apache Traffic Server 8.0.0 to 9.0.2.

7.5CVSS7.3AI score0.0008EPSS

CVE•added 2022/08/10 6:15 a.m.•63 views

CVE-2022-31780

Improper Input Validation vulnerability in HTTP/2 frame handling of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.

7.5CVSS7.3AI score0.00214EPSS

CVE•added 2023/08/09 7:15 a.m.•62 views

CVE-2022-47185

Improper input validation vulnerability on the range header in Apache Software Foundation Apache Traffic Server.This issue affects Apache Traffic Server: through 9.2.1.

7.5CVSS8.3AI score0.00339EPSS

CVE•added 2022/08/10 6:15 a.m.•60 views

CVE-2022-31779

Improper Input Validation vulnerability in HTTP/2 header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.

7.5CVSS7.3AI score0.00104EPSS

CVE•added 2023/06/14 8:15 a.m.•60 views

CVE-2023-33933

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache Software Foundation Apache Traffic Server.This issue affects Apache Traffic Server: from 8.0.0 through 9.2.0. 8.x users should upgrade to 8.1.7 or later versions9.x users should upgrade to 9.2.1 or later versions

7.5CVSS7.3AI score0.00113EPSS

CVE•added 2024/11/14 10:15 a.m.•59 views

CVE-2024-50305

Valid Host header field can cause Apache Traffic Server to crash on some platforms. This issue affects Apache Traffic Server: from 9.2.0 through 9.2.5. Users are recommended to upgrade to version 9.2.6, which fixes the issue, or 10.0.2, which does not have the issue.

7.5CVSS7.4AI score0.00965EPSS

CVE•added 2022/08/10 6:15 a.m.•58 views

CVE-2021-37150

Improper Input Validation vulnerability in header parsing of Apache Traffic Server allows an attacker to request secure resources. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.

7.5CVSS7.3AI score0.00235EPSS

CVE•added 2021/11/03 4:15 p.m.•57 views

CVE-2021-37148

Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.

7.5CVSS7.4AI score0.00797EPSS

CVE•added 2024/11/14 10:15 a.m.•57 views

CVE-2024-38479

Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.5. Users are recommended to upgrade to version 9.2.6, which fixes the issue, or 10.0.2, which does not have the issue.

7.5CVSS7.4AI score0.00585EPSS

CVE•added 2021/01/11 10:15 a.m.•55 views

CVE-2020-17509

ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.

7.5CVSS7.3AI score0.03046EPSS

CVE•added 2022/12/19 11:15 a.m.•54 views

CVE-2022-32749

Improper Check for Unusual or Exceptional Conditions vulnerability handling requests in Apache Traffic Server allows an attacker to crash the server under certain conditions. This issue affects Apache Traffic Server: from 8.0.0 through 9.1.3.

7.5CVSS7.3AI score0.00393EPSS

CVE•added 2023/06/14 8:15 a.m.•54 views

CVE-2022-47184

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache Software Foundation Apache Traffic Server.This issue affects Apache Traffic Server: 8.0.0 to 9.2.0.

7.5CVSS7.3AI score0.00157EPSS

CVE•added 2022/08/10 6:15 a.m.•53 views

CVE-2022-28129

Improper Input Validation vulnerability in HTTP/1.1 header parsing of Apache Traffic Server allows an attacker to send invalid headers. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.

7.5CVSS7.3AI score0.00141EPSS

CVE•added 2017/04/17 6:59 p.m.•50 views

CVE-2017-5659

Apache Traffic Server before 6.2.1 generates a coredump when there is a mismatch between content length and chunked encoding.

7.5CVSS7.5AI score0.01533EPSS

CVE•added 2018/02/27 8:29 p.m.•50 views

CVE-2017-7671

There is a DOS attack vulnerability in Apache Traffic Server (ATS) 5.2.0 to 5.3.2, 6.0.0 to 6.2.0, and 7.0.0 with the TLS handshake. This issue can cause the server to coredump.

7.5CVSS7.3AI score0.0427EPSS

CVE•added 2021/11/03 4:15 p.m.•50 views

CVE-2021-37149

Improper Input Validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.

7.5CVSS7.4AI score0.00797EPSS

CVE•added 2021/11/03 4:15 p.m.•48 views

CVE-2021-41585

Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.

7.5CVSS7.5AI score0.00736EPSS

CVE•added 2017/04/17 6:59 p.m.•41 views

CVE-2016-5396

Apache Traffic Server 6.0.0 to 6.2.0 are affected by an HPACK Bomb Attack.

7.8CVSS7.4AI score0.01806EPSS

CVE•added 2018/08/29 1:29 p.m.•39 views

CVE-2018-8022

A carefully crafted invalid TLS handshake can cause Apache Traffic Server (ATS) to segfault. This affects version 6.2.2. To resolve this issue users running 6.2.2 should upgrade to 6.2.3 or later versions.

7.5CVSS7.4AI score0.07893EPSS

CVE•added 2025/06/19 10:15 a.m.•37 views

CVE-2025-49763

ESI plugin does not have the limit for maximum inclusion depth, and that allows excessive memory consumption if malicious instructions are inserted. Users can use a new setting for the plugin (--max-inclusion-depth) to limit it.This issue affects Apache Traffic Server: from 10.0.0 through 10.0.5, f...

7.5CVSS6.5AI score0.00296EPSS

CVE•added 2025/06/19 10:15 a.m.•18 views

CVE-2025-31698

ACL configured in ip_allow.config or remap.config does not use IP addresses that are provided by PROXY protocol. Users can use a new setting (proxy.config.acl.subjects) to choose which IP addresses to use for the ACL if Apache Traffic Server is configured to accept PROXY protocol. This issue affect...

7.5CVSS6.5AI score0.00098EPSS