CVE-2021-44543
An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-44543- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 2.6 Low
AV:N/AC:H/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-44543- Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2021-31374 No score
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.
- Record
EUVD-2021-31374- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-hf3j-m5fx-q82c No score
An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode...
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.
- Record
GHSA-hf3j-m5fx-q82c- Weakness
- CWE-79
- Updated
- 2026-11-02
OSVALPINE-CVE-2021-44543
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.
- Record
ALPINE-CVE-2021-44543- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-44543- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Show 7 moreShow less
OSVDEBIAN-CVE-2021-44543
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.
- Record
DEBIAN-CVE-2021-44543- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-44543
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.
- Record
UBUNTU-CVE-2021-44543- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVMGASA-2021-0570 No score
Updated privoxy packages fix security vulnerabilities
Updated privoxy packages fix security vulnerabilities:
A security issue has been found in Privoxy before version 3.0.33. get_url_spec_param() did not free memory of compiled pattern spec before bailing (CVE-2021-44540).
A security issue has been found in Privoxy before version 3.0.33. process_encrypted_request_headers() did not free header memory when failing to get the request destination (CVE-2021-44541).
A security issue has been found in Privoxy before version 3.0.33. send_http_request() leaked memory when handling errors (CVE-2021-44542).
A security issue has been found in Privoxy before version 3.0.33. cgi_error_no_template() did not encode the template name, which could lead to cross-site scripting when Privoxy is configured to servce the user-manual itself (CVE-2021-44543).
- Record
MGASA-2021-0570- Updated
- 2026-11-02
OSVopenSUSE-SU-2021:1646-1 No score
Security update for privoxy
This update for privoxy fixes the following issues:
privoxy was updated to 3.0.33 (boo#1193584):
- CVE-2021-44543: Encode the template name to prevent XSS (cross-side scripting) when Privoxy is configured to servce the user-manual itself
- CVE-2021-44540: Free memory of compiled pattern spec before bailing
- CVE-2021-44541: Free header memory when failing to get the request destination.
- CVE-2021-44542: Prevent memory leaks when handling errors
- Disable fast-redirects for a number of domains
- Update default block lists
- Many bug fixes and minor enhancements
- Record
openSUSE-SU-2021:1646-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2022:10186-1 No score
Security update for privoxy
This update for privoxy fixes the following issues:
privoxy was updated to 3.0.33 (boo#1193584):
- CVE-2021-44543: Encode the template name to prevent XSS (cross-side scripting) when Privoxy is configured to servce the user-manual itself
- CVE-2021-44540: Free memory of compiled pattern spec before bailing
- CVE-2021-44541: Free header memory when failing to get the request destination.
- CVE-2021-44542: Prevent memory leaks when handling errors
- Disable fast-redirects for a number of domains
- Update default block lists
- Many bug fixes and minor enhancements
- Record
openSUSE-SU-2022:10186-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11677-1 No score
privoxy-3.0.33-1.1 on GA media
These are all security issues fixed in the privoxy-3.0.33-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11677-1- Updated
- 2026-11-02
OSVUSN-5826-1 No score
privoxy vulnerabilities
Joshua Rogers discovered that Privoxy incorrectly handled memory allocation. An attacker could possibly use this issue to cause a denial of service. (CVE-2021-44540)
Artem Ivanov discovered that Privoxy incorrectly handled input validations. An attacker could possibly use this issue to perform cross-site scripting (XSS) attacks. (CVE-2021-44543)
- Record
USN-5826-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
privoxyAlpine:v3.12 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.13 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.14 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.15 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.16 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.17 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.18 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.19 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.20 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.21 |
before 3.0.33-r0 | 3.0.33-r0 |
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| Package | Affected | Fixed |
|---|---|---|
privoxyAlpine:v3.22 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.23 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyAlpine:v3.24 |
before 3.0.33-r0 | 3.0.33-r0 |
privoxyDebian:12 |
before 3.0.33-1 | 3.0.33-1 |
privoxyDebian:13 |
before 3.0.33-1 | 3.0.33-1 |
privoxyDebian:14 |
before 3.0.33-1 | 3.0.33-1 |
privoxyDebian:9 From an advisory covering 2 CVEs |
before 3.0.26-3+deb9u3, plus listed versions 3.0.26-33.0.26-3+deb9u13.0.26-3+deb9u2 |
3.0.26-3+deb9u3 |
privoxyMageia:8 From an advisory covering 4 CVEs |
before 3.0.32-1.1.mga8 | 3.0.32-1.1.mga8 |
privoxyUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 3.0.21-13.0.21-23.0.21-7+deb8u1build0.14.04.13.0.21-7+deb8u1ubuntu0.1~esm1 |
None known |
privoxyUbuntu:16.04:LTS |
All versions, plus listed versions 3.0.23-33.0.23-43.0.23-53.0.24-13.0.24-1ubuntu0.1 |
None known |
privoxyUbuntu:18.04:LTS |
before 3.0.26-5ubuntu0.3, plus listed versions 3.0.26-33.0.26-43.0.26-53.0.26-5ubuntu0.1 |
3.0.26-5ubuntu0.3 |
privoxyUbuntu:20.04:LTS |
before 3.0.28-2ubuntu0.2, plus listed versions 3.0.28-23.0.28-2ubuntu0.1 |
3.0.28-2ubuntu0.2 |
privoxyUbuntu:18.04:LTS From an advisory covering 2 CVEs |
before 3.0.26-5ubuntu0.3, plus listed versions 3.0.26-33.0.26-43.0.26-53.0.26-5ubuntu0.1 |
3.0.26-5ubuntu0.3 |
privoxyUbuntu:20.04:LTS From an advisory covering 2 CVEs |
before 3.0.28-2ubuntu0.2, plus listed versions 3.0.28-23.0.28-2ubuntu0.1 |
3.0.28-2ubuntu0.2 |
privoxySUSE:Package Hub 15 SP3 From an advisory covering 4 CVEs |
before 3.0.33-bp153.2.3.1 | 3.0.33-bp153.2.3.1 |
privoxyopenSUSE:Leap 15.2 From an advisory covering 4 CVEs |
before 3.0.33-bp153.2.3.1 | 3.0.33-bp153.2.3.1 |
privoxyopenSUSE:Leap 15.3 From an advisory covering 4 CVEs |
before 3.0.33-bp153.2.3.1 | 3.0.33-bp153.2.3.1 |
privoxySUSE:Package Hub 15 SP4 From an advisory covering 4 CVEs |
before 3.0.33-bp154.3.3.1 | 3.0.33-bp154.3.3.1 |
privoxyopenSUSE:Leap 15.4 From an advisory covering 4 CVEs |
before 3.0.33-bp154.3.3.1 | 3.0.33-bp154.3.3.1 |
privoxyopenSUSE:Tumbleweed From an advisory covering 4 CVEs |
before 3.0.33-1.1 | 3.0.33-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-44543 is a medium vulnerability (CVSS 6.1) in Privoxy, published December 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. Fixed in privoxy 3.0.33-r0.
References
privoxy.org/3.0.33/user-manual/whatsnew.html%2C
nvd.nist.gov/vuln/detail/CVE-2021-44543
github.com/advisories/GHSA-hf3j-m5fx-q82c
Show 17 moreShow less
security.alpinelinux.org/vuln/CVE-2021-44543
security-tracker.debian.org/tracker/CVE-2021-44543
advisories.mageia.org/MGASA-2021-0570.html
bugs.mageia.org/show_bug.cgi?id=29745
ubuntu.com/security/CVE-2021-44543
openwall.com/lists/oss-security/2021/12/09/1
cve.org/CVERecord?id=CVE-2021-44543
lists.opensuse.org/archives/list/[email protected]/thread/QYO5MMUZFNF4G2ZDKAE76JYKJCV2JPWK
bugzilla.suse.com/1193584
suse.com/security/cve/CVE-2021-44540