Memory leak in privoxy
Priority LOW 37CWE-401Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-401.
Summary
A memory leak vulnerability was found in Privoxy before 3.0.29 in the show-status CGI handler when no action files are configured.
Why it matters now
EPSS 0.01897 79th percentileScored 2026-11-07
Fix Fixed privoxy: 3.0.29
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | privoxy | before 3.0.29 | 3.0.29 | Patch available | CNA |
- privoxy Vendor— Affected before 3.0.29 Fixed in 3.0.29 Patch available CNA
Remediation
- Fix · CNA privoxy Fixed in 3.0.29
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20209
- 2026-10-03 Alias added: GHSA-qf5g-m559-vx7x
References
More Privoxy vulnerabilities
- TI-2016-01816 The client_host function in parsers.c in Privoxy before 3.0.24 allows remote attackers to… CVSS 3.0HIGH 7.5
- TI-2016-01815 The remove_chunked_transfer_coding function in filters.c in Privoxy before 3.0.24 allows… CVSS 3.0HIGH 7.5
- TI-2021-03567 Memory corruption in privoxy CVSS 3.1HIGH 7.5
- TI-2021-03566 Memory corruption in privoxy CVSS 3.1HIGH 7.5
- TI-2021-03565 NULL pointer dereference in privoxy CVSS 3.1HIGH 7.5
- TI-2021-03564 Improper input validation in privoxy CVSS 3.1HIGH 7.5
Sources
- CVE-2021-20209 · CVE Program
- CVE-2021-20209 · NVD
- FIRST EPSS
- GHSA-qf5g-m559-vx7x · GitHub Advisory Database · CC BY 4.0
- CVE-2021-20209 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences