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Fencer Intel
high 7.5

CVE-2018-1000024 json

The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerabi…

published 8y ago modified 4mo ago also EUVD-2018-1786

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.9%
EPSS 7.9% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed in 4.0.23 and later.

Patch / fix

  • squid Debian 14, Debian 13, Debian 12 4.1-1

debian advisories DEBIAN-CVE-2018-1000024

  • squid3 Ubuntu 14.04 LTS 3.3.8-1ubuntu6.11
  • squid3 Ubuntu 16.04 LTS 3.5.12-1ubuntu7.5
  • squid3 Ubuntu 18.04 LTS 3.5.23-5ubuntu2

ubuntu advisories UBUNTU-CVE-2018-1000024

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 7:3.5.20-15.el7
  • squid-sysvinit RHEL 7 7:3.5.20-15.el7
  • squid-migration-script RHEL 7 7:3.5.20-15.el7

red hat advisories RHSA-2020:1068

  • squid3 SLES for SAP 11 SP4, SLES 11 SP4 3.1.23-8.16.37.3.1
  • squid SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +2 more 3.5.21-26.6.1

suse advisories SUSE-SU-2018:0752-1SUSE-SU-2018:0636-1

  • squid openSUSE Tumbleweed 4.16-1.5

opensuse advisories openSUSE-SU-2024:11403-1

  • squid Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 3.5.27-r2
  • squid Alpine 3.7, Alpine 3.6, Alpine 3.5 +1 more 3.5.27-r0

alpine advisories ALPINE-CVE-2018-1000024

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2018-1000024 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2018-1000024 updated cvss 7.4

squid: Incorrect pointer handling when processing ESI Responses can lead to denial of service

  • Red Hat Enterprise Linux 6 squid, squid34
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux Server (v. 7) squid 3.5.20-15.el7, squid-migration-script 3.5.20-15.el7 Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit 3.5.20-15.el7 Red Hat Enterprise Linux Workstation (v. 7) squid 3.5.20-15.el7, squid-migration-script 3.5.20-15.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit 3.5.20-15.el7
    fixed: vendor fix RHSA-2020:1068
  • Red Hat Enterprise Linux 5 squid Red Hat Enterprise Linux 8 squid, libecap
    not affected: vulnerable code not present

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

Exploit prediction

7.93% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

References

Sources

Fencer Intel 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.