CVE-2020-11945

Squid vulnerability CVE-2020-11945 is confirmed in various advisories for Squid prior to 5.0.2, where a remote attacker can replay a sniffed Digest Authentication nonce due to overflow of the nonce reference counter, potentially enabling remote code execution if pooled token credentials are freed...

CVE-2020-15049

CVE-2020-15049 affects Squid up to 4.12 and 5.x up to 5.0.3. It enables a Request Smuggling and Poisoning attack against the HTTP cache by sending Content-Length values with a prefix like +, - or uncommon whitespace. Affected component: http/ContentLengthInterpreter.cc. Impact: potential cache po...

CVE-2019-12519

CVE-2019-12519 in Squid (up to 4.7) originates from ESI handling: ESIExpression::Evaluate uses a fixed stack buffer and does not check for overflow when adding a new member, causing a stack/heap overflow under certain expressions and potentially impacting confidentiality, integrity, and availabil...

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-2021-46784

The CVE-2021-46784 issue affects Squid 3.x–3.5.28, 4.x–4.17, and 5.x prior to 5.6, caused by improper buffer management that can lead to a Denial of Service when processing long Gopher server responses. Affected releases are vulnerable to DoS; remediation is to update to a fixed version (5.6 or l...

CVE-2021-31807

CVE-2021-31807: Squid before 4.15 and 5.x before 5.0.6 suffers an integer overflow in handling HTTP Range responses, enabling a remote attacker to cause a Denial of Service. The trigger is a header that can appear in normal traffic. Affected products/versions: Squid 4.x before 4.15 and 5.x before...

CVE-2019-12521

CVE-2019-12521 is a Squid vulnerability where, while parsing ESI, the ESIContext buffer used to hold ESIElements is overflowed due to an off-by-one bug in addStackElement. The overflow is within the same structure and causes a crash during processing (not adjacent memory corruption). Affected: Sq...

CVE-2021-28652

CVE-2021-28652 concerns Squid before 4.15 and 5.x before 5.0.6. The issue stems from incorrect parser validation, allowing a Denial of Service attack against the Cache Manager API. A trusted client with Cache Manager API access can trigger memory leaks that, over time, lead to a DoS via an unspec...

CVE-2021-31806

CVE-2021-31806 is a memory-management bug in Squid’s HTTP Range request processing that enables a Denial of Service against all clients using the proxy. Affected are Squid releases before 4.15 and 5.x before 5.0.6. Public advisories and vendor/procurer notes corroborate impact as DoS (not informa...

CVE-2021-28116

Squid 4.14 and 5.x up to 5.0.5 are affected by an information-disclosure issue due to an out-of-bounds read in WCCP protocol data, which can be chained to remote code execution as nobody. The connected advisories/entries indicate fixes in newer Squid releases (e.g., subsequent 4.15/5.0.6+ variant...

CVE-2020-15810

CVE-2020-15810 affects Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling may succeed against HTTP/HTTPS traffic, leading to cache poisoning and the ability for arbitrary content to be served from upstream caches. When relaxed header parsing is enable...

CVE-2021-28662

CVE-2021-28662 affects Squid 4.x before 4.15 and 5.x before 5.0.6. A remote server sending a certain HTTP/HTTPS response header can trigger a denial-of-service in the proxy via input/response handling. This is the same class of DoS as described in multiple advisories (e.g., Arch Linux, Debian, Al...

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-2020-15811

CVE-2020-15811 affects Squid before 4.13 and 5.x before 5.0.4, allowing HTTP Request Splitting that can poison caches by mishandling Transfer-Encoding. The issue is confirmed in vendor advisories (ALAS2SQUID4-2023-006; ALAS-2020-1453; ALAS2-2020-1548) which recommend updating Squid to fixed build...

CVE-2021-33620

Summary: CVE-2021-33620 affects Squid before 4.15 and 5.x before 5.0.6. It can cause a denial of service across all clients via an HTTP response, triggered by a header that can appear in legitimate traffic. What’s affected: Squid proxy/cache (core components handling HTTP traffic). Root cause (pe...

CVE-2021-31808

CVE-2021-31808 affects Squid before 4.15 and 5.x before 5.0.6. It stems from an input-validation bug in HTTP Range handling that can be exploited to cause a Denial of Service against all clients using the proxy. Affected component: Squid’s HTTP Range request processing. Impact: availability degra...

CVE-2024-23638

CVE-2024-23638 affects Squid web proxy: an expired pointer reference bug causes DoS during Cache Manager error-page handling. Vulnerable: all Squid-5.x up to 5.9 and all Squid-6.x up to 6.5; fixed in 6.6. Workarounds include denying Cache Manager access with http_access deny manager. Affected pla...

CVE-2020-14059

Squid 5.x prior to 5.0.3 is affected by CVE-2020-14059 due to an incorrect synchronization in the SMP cache, causing a Denial of Service via Ipc::Mem::PageStack::pop ABA during memory page/slot management. Affected component is the memory/page management list, with exploitation leading to a crash...