Collapse of Data into Unsafe Value in Squid - CVE-2024-28177
Published: November 3, 2026
Vulnerability identifier: #VU158701
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2024-28177
CWE-ID: CWE-182
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a collapse of data into an unsafe value in Squid's ESI header handling when processing oversized ESI headers. A remote attacker can send oversized ESI headers to cause a denial of service.
ESI is an optional feature and is not built by default.
Affected software
Squid
How to mitigate CVE-2024-28177
Install security update from vendor's website.
Squid - update to 6.5