CVE-2021-44543: An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode the template na

Q: How do I fix CVE-2021-44543?

privoxy: upgrade to 3.0.33. Exact commands for each OS are on this page.

Q: Is CVE-2021-44543 being exploited?

CVE-2021-44543 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-44543 affect?

CVE-2021-44543 affects privoxy. Severity is medium (CVSS 6.1). 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.

Q: How urgent is CVE-2021-44543?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2021-44543 is a medium-severity flaw (CVSS 6.1) affecting privoxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-23
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: privoxy

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-23 20:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

privoxy privoxy UPGRADE

Affected: < 3.0.33

Fixed in: 3.0.33

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy privoxy || rpm -q privoxy || privoxy --version

2. UPGRADE to 3.0.33 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade privoxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade privoxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-44543?

privoxy: upgrade to 3.0.33. Exact commands for each OS are on this page.

Is CVE-2021-44543 being exploited?

CVE-2021-44543 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-44543 affect?

CVE-2021-44543 affects privoxy. Severity is medium (CVSS 6.1). 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.

How urgent is CVE-2021-44543?

Priority 35/100. No elevated risk signals yet.

Related CVEs

CVE-2021-44542 HIGH 7.5 UPGRADE A memory leak vulnerability was found in Privoxy when handling errors.
CVE-2021-44541 HIGH 7.5 UPGRADE A vulnerability was found in Privoxy which was fixed in process_encrypted_request_headers() by freeing header
CVE-2021-44540 HIGH 7.5 UPGRADE A vulnerability was found in Privoxy which was fixed in get_url_spec_param() by freeing memory of compiled pat
CVE-2021-20276 HIGH 7.5 UPGRADE MITIGATE A flaw was found in privoxy before 3.0.32
CVE-2021-20275 HIGH 7.5 UPGRADE MITIGATE A flaw was found in privoxy before 3.0.32

References

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