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Fencer Intel
medium 6.1

CVE-2018-19131 json

Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.

published 8y ago modified 4mo ago also EUVD-2018-10844

cvss
6.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.

Patch / fix

  • squid-cache squid 4.4
  • squid Debian 14, Debian 13, Debian 12 4.4-1

debian advisories DEBIAN-CVE-2018-19131

  • squid SLES 12 SP4, SLES 12 SP3, SLES for SAP 12 SP4 +1 more 3.5.21-26.12.1
  • squid SLE Module for Server Applications 15 4.4-5.3.2
  • squid3 SLES for SAP 11 SP4, SLES 11 SP4 3.1.23-8.16.37.9.1

suse advisories SUSE-SU-2018:3771-2SUSE-SU-2018:3786-1SUSE-SU-2018:3790-1SUSE-SU-2018:3771-1

  • squid openSUSE Tumbleweed 4.16-1.5

opensuse advisories openSUSE-SU-2024:11403-1

Is CVE-2018-19131 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-2018-19131 updated cvss 5.6

squid: Cross-Site Scripting when generating HTTPS response messages about TLS errors

  • Red Hat Enterprise Linux 6 squid, squid34 Red Hat Enterprise Linux 7 squid, squid-sysvinit, squid-migration-script
    affected: workaround, no fix planned “Remove %D error page macro from ERR_SECURE_CONNECT_FAIL pages found under /usr/share/squid/errors/ and any custom error pages.”
  • 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

3.32% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.