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Fencer Vulns
medium 5.3

CVE-2024-25617 json

Denial of Service in HTTP Header parser in squid proxy

published 2024-02-14 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-22939

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
88.1%
EPSS 88.1% chance of exploitation in 30 days, percentile 99.7%
public exploits
0
none known

Summary

Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2

Patch / fix

  • squid-cache squid 6.5
  • squid Debian 12 5.7-2+deb12u1
  • squid Debian 14, Debian 13 6.5-1

debian advisories DEBIAN-CVE-2024-25617

  • squid Ubuntu 20.04 LTS 4.10-1ubuntu1.10
  • squid Ubuntu 22.04 LTS 5.7-0ubuntu0.22.04.4
  • squid Ubuntu 24.04 LTS 6.5-1ubuntu1
  • squid3 Ubuntu Pro 16.04 LTS 3.5.12-1ubuntu7.16+esm3
  • squid3 Ubuntu Pro 18.04 LTS 3.5.27-1ubuntu1.14+esm2

ubuntu advisories UBUNTU-CVE-2024-25617

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • squid RHEL 7 7:3.5.20-17.el7_9.10
  • squid-sysvinit RHEL 7 7:3.5.20-17.el7_9.10
  • squid-migration-script RHEL 7 7:3.5.20-17.el7_9.10
  • squid RHEL 9 7:5.5-6.el9_3.8
  • squid RHEL 8 7:4.15-7.module+el8.9.0+21530+59b09a5b.10
  • libecap RHEL 8 1.0.1-2.module+el8.9.0+19703+a1da7223
  • squid RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 7:4.4-8.module+el8.2.0+21527+aa63d5ff.9
  • libecap RHEL 8.8 EUS, RHEL 8.6 EUS, RHEL 8.4 TUS +5 more 1.0.1-2.module+el8.1.0+4044+36416a77

red hat advisories RHSA-2024:2777RHSA-2024:1833RHSA-2024:1832RHSA-2024:1787RHSA-2024:1376RHSA-2024:1375

  • squid SLES for SAP 12 SP5, SLES 12 SP5 4.17-4.44.1
  • squid SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +4 more 4.17-150000.5.52.1
  • squid SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Server Applications 15 SP5 +5 more 5.7-150400.3.26.1

suse advisories SUSE-SU-2024:1115-1SUSE-SU-2024:1114-1SUSE-SU-2024:1113-1

  • squid openSUSE Tumbleweed 6.8-1.1

opensuse advisories openSUSE-SU-2024:13757-1

  • squid AlmaLinux 8 7:4.15-7.module_el8.9.0+3749+dbf371ed.10
  • libecap AlmaLinux 8 1.0.1-2.module_el8.6.0+2741+01592ae8
  • libecap AlmaLinux 8 1.0.1-2.module_el8.6.0+3048+383bc947
  • squid AlmaLinux 9 7:5.5-6.el9_3.8

almalinux advisories ALSA-2024:1375ALSA-2024:1376

  • libecap Rocky Linux 8 1.0.1-2.module+el8.9.0+1437+df5ea8f0

rocky linux advisories RLSA-2024:1375

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-25617 updated cvss 8.6

squid: denial of service in HTTP header parser

  • Red Hat Enterprise Linux 6 squid, squid34
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) libecap 1.0.1-2.module+el8.9.0+19703+a1da7223, squid 4.15-7.module+el8.9.0+21530+59b09a5b.10
    fixed: vendor fix RHSA-2024:1375
  • Red Hat Enterprise Linux AppStream (v. 9) squid 5.5-6.el9_3.8
    fixed: vendor fix RHSA-2024:1376
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) squid 4.4-8.module+el8.2.0+21527+aa63d5ff.9, libecap 1.0.1-2.module+el8.1.0+4044+36416a77
    fixed: vendor fix RHSA-2024:2777
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) libecap 1.0.1-2.module+el8.1.0+4044+36416a77, squid 4.11-4.module+el8.4.0+21523+3cc98f8b.8
    fixed: vendor fix RHSA-2024:1832
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) squid 4.4-8.module+el8.2.0+21527+aa63d5ff.9, libecap 1.0.1-2.module+el8.1.0+4044+36416a77
    fixed: vendor fix RHSA-2024:2777
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) libecap 1.0.1-2.module+el8.1.0+4044+36416a77, squid 4.11-4.module+el8.4.0+21523+3cc98f8b.8
    fixed: vendor fix RHSA-2024:1832
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) libecap 1.0.1-2.module+el8.1.0+4044+36416a77, squid 4.15-3.module+el8.6.0+21376+425c674a.5
    fixed: vendor fix RHSA-2024:1066
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) libecap 1.0.1-2.module+el8.1.0+4044+36416a77, squid 4.15-6.module+el8.8.0+21374+5b4927f1.4
    fixed: vendor fix RHSA-2024:1062
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) squid 5.2-1.el9_0.6
    fixed: vendor fix RHSA-2024:1833
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) squid 5.5-5.el9_2.5
    fixed: vendor fix RHSA-2024:1184
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) squid 4.4-8.module+el8.2.0+21527+aa63d5ff.9, libecap 1.0.1-2.module+el8.1.0+4044+36416a77
    fixed: vendor fix RHSA-2024:2777
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) libecap 1.0.1-2.module+el8.1.0+4044+36416a77, squid 4.11-4.module+el8.4.0+21523+3cc98f8b.8
    fixed: vendor fix RHSA-2024:1832
  • Red Hat Enterprise Linux Server (v. 7) squid 3.5.20-17.el7_9.10, squid-migration-script 3.5.20-17.el7_9.10 Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit 3.5.20-17.el7_9.10 Red Hat Enterprise Linux Workstation (v. 7) squid 3.5.20-17.el7_9.10, squid-migration-script 3.5.20-17.el7_9.10 Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit 3.5.20-17.el7_9.10
    fixed: vendor fix RHSA-2024:1787

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

88.09% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • squid-cache squid

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-182 Collapse of Data into Unsafe Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.