CVE-2025-62168

Description

Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication credentials in error handling allows information disclosure. The vulnerability allows a script to bypass browser security protections and learn the credentials a trusted client uses to authenticate. This potentially allows a remote client to identify security tokens or credentials used internally by a web application using Squid for backend load balancing. These attacks do not require Squid to be configured with HTTP authentication. The vulnerability is fixed in version 7.2. As a workaround, disable debug information in administrator mailto links generated by Squid by configuring squid.conf with email_err_data off.

CVSS v3.1 Score

10.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Weakness Type (CWE)

CWE-209 CWE-209

CWE-550 CWE-550

Affected Products

Vendor	Product	Versions
squid-cache	squid	< 7.2

References

Advisories & Patches

https://github.com/squid-cache/squid/commit/0951a0681011dfca3d78c84fd7f1e19c78a4443f

Other References

https://github.com/squid-cache/squid/security/advisories/GHSA-c8cc-phh7-xmxr http://www.openwall.com/lists/oss-security/2025/11/05/6

Frequently Asked Questions

What is CVE-2025-62168? +

Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication credentials in error handling allows information disclosure. The vulnerability allows a script to bypass browser security protections and learn the credentials a trusted client uses to authenticate. This potentially allows a remote client to identify security tokens or credentials used internally by a web application using Squid for backend load balancing. These attacks do not require Squid to be configured with HTTP authentication. The vulnerability is fixed in version 7.2. As a workaround, disable debug information in administrator mailto links generated by Squid by configuring squid.conf with email_err_data off. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2025-62168? +

CVE-2025-62168 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-62168? +

CVE-2025-62168 affects products from squid-cache, specifically: squid. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-62168? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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