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No exploitation reportedFix available

CVE-2023-46724

No exploitation reported by the sources we read.

  • Published2023-11-01
  • Fixed in6.4
  • WeaknessCWE-125 · CWE-1285 · CWE-129

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-11-0120:15CVE publishedNVD

Versions per branch

NVD
Squid-cache squid
BranchAffectedFixed in
6.4≥ 3.3.0.1, < 6.46.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • squid-cache squid
    Affected
    • = >= 3.3.0.1, < 6.4no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-12-29

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libecapRocky Linux:8all versions · fixed in 0:1.0.1-2.module+el8.9.0+1437+df5ea8f0
  • libecapRed Hat:rhel_tus:8.4::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapRed Hat:rhel_tus:8.2::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapRed Hat:rhel_eus:8.8::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapRed Hat:rhel_eus:8.6::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapRed Hat:rhel_e4s:8.4::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapRed Hat:rhel_e4s:8.2::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapRed Hat:rhel_aus:8.4::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages

73 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Squid-cache squid to 6.4

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2024-09-05
  • CNACVSS 3.18.6known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-125, CWE-1285, CWE-129, CWE-786, CWE-823known since 2026-10-23
  • NVDweakness (CWE)CWE-295read 2026-10-23
  • FIRST EPSSEPSS score2.8 %2026-11-09
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2023-11-01
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-46724?

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.

Is CVE-2023-46724 actively exploited?

Active exploitation of CVE-2023-46724 has not been confirmed. Its EPSS score was 2.8% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-46724?

CVE-2023-46724 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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