CVE-2023-5824Squid: dos against http and https
- 7.5HighCVSS base score
- 3.3%Exploitation in 30 daysEPSS · top 11% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP response header beyond the configured maximum size, causing a stall or crash of the worker process when a large header is retrieved from the disk cache, resulting in a denial of service.
Timeline
ID reserved
By redhat
- 7 days later
· 7 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 3.3% · top 11% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
Red Hat · Red Hat Enterprise Linux 8
- unaffected 8090020231130092412.a75119d5 – < *
Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support
- unaffected 8020020240122164331.4cda2c84 – < *
Red Hat · Red Hat Enterprise Linux 8.2 Telecommunications Update Service
- unaffected 8020020240122164331.4cda2c84 – < *
Red Hat · Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
- unaffected 8020020240122164331.4cda2c84 – < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- unaffected 8040020240122165847.522a0ee4 – < *
Red Hat · Red Hat Enterprise Linux 8.4 Telecommunications Update Service
- unaffected 8040020240122165847.522a0ee4 – < *
Red Hat · Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
- unaffected 8040020240122165847.522a0ee4 – < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support
- unaffected 8060020231222131040.ad008a3a – < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support
- unaffected 8080020231222130009.63b34585 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 7:5.5-6.el9_3.2 – < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support
- unaffected 7:5.2-1.el9_0.4 – < *
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support
- unaffected 7:5.5-5.el9_2.3 – < *
Red Hat · Red Hat Enterprise Linux 6
All versions: affected
Red Hat · Red Hat Enterprise Linux 7
All versions: affected
What to do
Workaround: Disabling the disk caching mechanism will mitigate this vulnerability. To achieve this, remove all the 'cache_dir' directives from the Squid configuration, typically in the /etc/squid/squid.conf file.
References
References13
- RHSA-2023:7465 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2023:7668 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0072 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0397 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0771 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0772 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0773 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:1153 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://access.redhat.com/security/cve/CVE-2023-5824 (opens in a new tab)vdb-entryx_refsource_REDHATx_transferred
- RHBZ#2245914 (opens in a new tab)issue-trackingx_refsource_REDHATx_transferred
- https://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255 (opens in a new tab)x_transferred
- https://security.netapp.com/advisory/ntap-20231130-0003/ (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-58107 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-5824)Record last updated .