# CVE-2023-46724

## Summary

- **CVE ID:** CVE-2023-46724
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
- **CWE:** CWE-125, CWE-129, CWE-786, CWE-823, CWE-1285
- **Published:** Nov 1, 2023
- **Last Modified:** Mar 13, 2026

## Description

Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version 6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. Those who you use a prepackaged version of Squid should refer to the package vendor for availability information on updated packages.

## Affected Products

- squid-cache — squid (>= 3.3.0.1, < 6.4)

## References

- [CNA](https://github.com/squid-cache/squid/security/advisories/GHSA-73m6-jm96-c6r3)
- [CNA](https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810)
- [CNA](http://www.squid-cache.org/Versions/v5/SQUID-2023_4.patch)
- [CNA](http://www.squid-cache.org/Versions/v6/SQUID-2023_4.patch)
- [CNA](https://security.netapp.com/advisory/ntap-20231208-0001/)
- [CNA](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/)
- [CNA](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 58.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._