CVE-2020-8450

CVE-2020-8450 affects Squid prior to 4.10, caused by incorrect buffer management in reverse-proxy mode, allowing a remote client to trigger a buffer overflow. Connected advisories confirm a fix was released (e.g., updates to Squid 4.11+/4.10-era patches) across multiple distributions (CloudLinux,...

CVE-2021-28651

Concrete details found for CVE-2021-28651 in multiple advisories. Affected software: Squid proxy (versions before 4.15 and 5.x before 5.0.6). Root cause: a buffer-management/memory handling issue in the urn: scheme parsing leading to a memory leak; an attack path exists that can trigger large mem...

CVE-2019-18679

The CVE-2019-18679 issue affects Squid 2.x–4.x (through 4.8) and arises from incorrect data management during HTTP Digest Authentication, where nonce tokens contain the raw pointer byte value from heap memory. This information disclosure reduces ASLR effectiveness and could assist attackers targe...

CVE-2019-18676

CVE-2019-18676 affects Squid 3.x and 4.x up to 4.8, where incorrect input validation enables a heap-based buffer overflow that can cause a Denial of Service to all clients using the proxy. The connected advisories describe the issue scope and related CVEs in the same Squid codebase (URn/URI proce...

CVE-2019-12528

Squid is affected by CVE-2019-12528 (pre-4.10). A crafted FTP server can trigger disclosure of sensitive data from heap memory, including data from other sessions or non-Squid processes. Remediation in affected advisories involves upgrading Squid to a later version (at least 4.10+; many advisorie...

CVE-2020-8449

CVE-2020-8449 affects Squid prior to 4.10. The issue arises from improper input validation in HTTP request processing , allowing crafted requests to access resources that should be blocked by security filters. The connected advisories confirm a fix was released across multiple distributions (e.g....

CVE-2018-1000027

Summary (CVE-2018-1000027) The Squid HTTP Caching Proxy (Squid Software Foundation) versions prior to 4.0.23 contain a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can cause a Denial of Service for all clients of the proxy. Exploitation appears po...

CVE-2018-1000024

The CVE-2018-1000024 vulnerability affects Squid HTTP Caching Proxy (versions 3.0–3.5.27 and 4.0–4.0.22). It is caused by Incorrect Pointer Handling in ESI Response Processing, enabling a Denial of Service when a remote server delivers an HTTP response payload with valid but unusual ESI syntax. I...

CVE-2020-14058

CVE-2020-14058 affects Squid before 4.12 and 5.x before 5.0.3. The DoS condition occurs when opening a TLS connection to an attacker-controlled HTTPS server due to using a potentially dangerous function and mapping unrecognized error values to NULL, with later code expecting valid error strings. ...

CVE-2016-10002

CVE-2016-10002 impacts Squid HTTP Proxy. The issue arises from incorrect handling of If-None-Modified responses, where connection-specific cookie data could be leaked across clients due to not removing headers when serving cached responses. Affected Squid lines include 3.1.10–3.1.23, 3.2.0.3–3.5....

CVE-2020-8517

CVE-2020-8517 affects Squid prior to 4.10. The issue is an out-of-bounds write in the NTLM credentials parser within ext_lm_group_acl caused by incorrect input validation. This can terminate the helper process, which in turn terminates the Squid process and leads to a denial of service for all cl...

CVE-2023-5824

Summary: CVE-2023-5824 affects Squid. A flaw in how HTTP response headers are validated before caching allows a header to exceed the configured maximum size, causing a stall or crash of a worker process and resulting in a denial of service. What’s affected: Squid proxy caching server; multiple ad...

CVE-2019-12854

CVE-2019-12854 affects Squid up to 4.7, where incorrect string termination in cachemgr.cgi can cause access to unallocated memory and DoS for clients. Public advisories document this as a Denial of Service vector and list Squid 4.0–4.7 as affected; remediation seen in later vendor advisories/upda...

CVE-2019-12520

CVE-2019-12520 affects Squid (versions up to 4.7 and 5.x per the sources). The vulnerability arises when Squid handles a request by computing an MD5 hash of the absolute URL to check the cache; if the URL includes a decoded UserInfo (username:password), that info is prepended to the domain. An at...

CVE-2023-46728

CVE-2023-46728 affects the Squid proxy where a NULL pointer dereference in Squid’s Gopher gateway can cause a Denial of Service. The issue arises because the obsolete Gopher protocol was always available/enabled in older Squid versions; upstream has removed Gopher support in version 6.0.1, and se...

CVE-2016-10003

CVE-2016-10003 affects Squid HTTP Proxy 3.5.0.1–3.5.22 and 4.0.1–4.0.16, where the Collapsed Forwarding feature can incorrectly deliver private responses to multiple clients due to incorrect HTTP header comparison. Connected documents confirm affected versions and describe the vulnerability class...

CVE-2024-25617

CVE-2024-25617 affects Squid, an open source web proxy/cache. The issue is a DoS in HTTP header parsing caused by a Collapse of Data into Unsafe Value, triggered by oversized headers. The vulnerability is exploitable via normal HTTP headers and is applicable to Squid versions prior to 6.5, where ...

CVE-2024-45802

CVE-2024-45802 affects Squid; Debian security update DLA-4083-1 notes the fix disables ESI to mitigate a Denial of Service due to Input Validation, Premature Release of Resource During Expected Lifetime, and Missing Release of Resource after Effective Lifetime bugs. Other advisories (CloudLinux, ...

CVE-2013-4115

CVE-2013-4115 : Buffer overflow in the idnsALookup function of Squid’s DNS lookup (dns_internal.cc) affects Squid 3.2–3.2.11 and 3.3–3.3.6, enabling a remote attacker to trigger memory corruption and cause a denial of service via a long DNS name. Connected advisories confirm affected products and...

CVE-2016-4556

Squid 3.x before 3.5.18 and 4.x before 4.0.10 is vulnerable to a double-free in Esi.cc (related to processing Edge Side Includes) which can allow remote servers to trigger a Denial of Service (crash). The issue is confirmed across multiple advisories (e.g., Debian DSA-3625-1, CentOS/RH advisories...

CVE-2013-1839

The CVE-2013-1839 issue affects Squid 3.2.x (pre-3.2.9) and 3.3.x (pre-3.3.3), where strHdrAcptLangGetItem in errorpage.cc can be triggered by a comma in Accept-Language, causing an infinite loop and high CPU usage (DoS). Impact is denial of service. Remediation: upgrade to fixed versions (3.2.9 ...

CVE-2021-41611

CVE-2021-41611 affects Squid 5.0.6 through 5.1.x before 5.2. During origin/peer certificate validation, Squid may misclassify certain certificates as trusted, potentially allowing a remote server to extend trust to clients and enable access to unsafe or hijacked services. The vulnerability’s CVSS...

CVE-2016-4555

CVE-2016-4555 affects Squid 3.x (before 3.5.18) and 4.x (before 4.0.10); DoS/crash via crafted Edge Side Includes (ESI) responses due to incorrect pointer handling and ref-counting. Connected advisories indicate fixes in Squid 3.4.8-6+deb8u3 and 3.5.19-1 (Debian), CentOS/RHSA advisories, and Fedo...

CVE-2016-2569

CVE-2016-2569 affects Squid (3.x before 3.5.15 and 4.x before 4.0.7). The issue is an incorrect boundary check when appending data to a String object for HTTP headers (notably the Vary header) in responses, which can cause an assertion failure and crash the daemon via a crafted header. Multiple c...

CVE-2016-2571

CVE-2016-2571 is a vulnerability in Squid where http.cc proceeds with storing data after a response-parsing failure, enabling remote HTTP servers to cause a denial of service via a malformed response. Affected: Squid 3.x before 3.5.15 and 4.x before 4.0.7. Mitigation: upgrade to 3.5.15+/4.0.7+ or...

CVE-2016-2570

CVE-2016-2570 affects Squid 3.x before 3.5.15 and 4.x before 4.0.7. The Edge Side Includes (ESI) parser does not check buffer limits during XML parsing, allowing remote HTTP servers to trigger a denial of service (assertion failure and daemon exit) with a crafted XML document (esi/CustomParser.cc...

CVE-2016-3948

CVE-2016-3948 affects Squid 3.x before 3.5.16 and 4.x before 4.0.8, where insufficient bounds checking on HTTP Vary headers allows remote attackers to cause a denial of service via a crafted HTTP response. Related advisories show fixes in newer Squid releases (e.g., 3.5.20 and 4.x series updates)...

CVE-2016-2572

CVE-2016-2572 affects Squid with http.cc in 4.x before 4.0.7. Root cause: after a response-parsing failure, Squid relies on the HTTP status code, enabling remote HTTP servers to trigger a denial of service (assertion failure and daemon exit) via a malformed response. Public advisories (e.g., Mira...

CVE-2005-0211

CVE-2005-0211 describes a buffer overflow in Squid’s WCCP handling: the wccp.c recvfrom path in Squid 2.5 before 2.5.STABLE7 processes an oversized WCCP packet due to an incorrect length parameter, enabling remote attackers to cause a denial of service and possibly execute arbitrary code. Affecte...