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Fencer Vulns
medium 6.1

CVE-2021-44543 json

An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode the template name when Privoxy is configured…

published 2021-12-23 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-31374

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode the template name when Privoxy is configured to servce the user-manual itself.

Patch / fix

  • privoxy privoxy 3.0.33
  • privoxy Debian 14, Debian 13, Debian 12 3.0.33-1

debian advisories DEBIAN-CVE-2021-44543

  • privoxy Ubuntu 18.04 LTS 3.0.26-5ubuntu0.3
  • privoxy Ubuntu 20.04 LTS 3.0.28-2ubuntu0.2

ubuntu advisories UBUNTU-CVE-2021-44543

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

  • privoxy openSUSE Tumbleweed 3.0.33-1.1
  • privoxy Package Hub 15 SP4, openSUSE Leap 15.4 3.0.33-bp154.3.3.1
  • privoxy Package Hub 15 SP3, openSUSE Leap 15.3, openSUSE Leap 15.2 3.0.33-bp153.2.3.1

opensuse advisories openSUSE-SU-2024:11677-1openSUSE-SU-2022:10186-1openSUSE-SU-2021:1646-1

  • privoxy Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 3.0.33-r0

alpine advisories ALPINE-CVE-2021-44543

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

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 2.6 AV:N/AC:H/Au:N/C:N/I:P/A:N

Affected products

  • n/a privoxy

Classification

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

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.