SARA / Free Tools / CVE / CVE-2023-5824

CVE-2023-5824 — A flaw was found in Squid

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 retrie

CVSS
7.5 HIGH
EPSS
1.88% (top 17.00%)
CWE
CWE-755
Published
2023-11-03T07:56:36.369Z
Last modified
2025-11-06T20:51:27.614Z
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

01What is this vulnerability?

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.

02Affected products

VendorProductVersions
Red HatRed Hat Enterprise Linux 88090020231130092412.a75119d5
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Support8020020240122164331.4cda2c84
Red HatRed Hat Enterprise Linux 8.2 Telecommunications Update Service8020020240122164331.4cda2c84
Red HatRed Hat Enterprise Linux 8.2 Update Services for SAP Solutions8020020240122164331.4cda2c84
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support8040020240122165847.522a0ee4
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update Service8040020240122165847.522a0ee4
Red HatRed Hat Enterprise Linux 8.4 Update Services for SAP Solutions8040020240122165847.522a0ee4
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support8060020231222131040.ad008a3a
Red HatRed Hat Enterprise Linux 8.8 Extended Update Support8080020231222130009.63b34585
Red HatRed Hat Enterprise Linux 97:5.5-6.el9_3.2
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support7:5.2-1.el9_0.4
Red HatRed Hat Enterprise Linux 9.2 Extended Update Support7:5.5-5.el9_2.3
Red HatRed Hat Enterprise Linux 6unspecified
Red HatRed Hat Enterprise Linux 7unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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