Privoxy before 3.0.21 does not properly handle Proxy-Authenticate and Proxy-Authorization…
Priority LOW 34CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · None
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
Privoxy before 3.0.21 does not properly handle Proxy-Authenticate and Proxy-Authorization headers in the client-server data stream, which makes it easier for remote HTTP servers to spoof the intended proxy service via a 407 (aka Proxy Authentication Required) HTTP status code.
Why it matters now
EPSS 0.04632 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Will not fix Red Hat: no fix planned
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 31
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:privoxy:privoxy:*:beta:*:*:*:*:*:* | up to 3.0.20 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.0:pre-alpha:*:*:*:*:*:* | 2.9.0 pre-alpha | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.1:pre-alpha:*:*:*:*:*:* | 2.9.1 pre-alpha | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.2:pre-alpha:*:*:*:*:*:* | 2.9.2 pre-alpha | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.3:pre-alpha:*:*:*:*:*:* | 2.9.3 pre-alpha | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.11:alpha:*:*:*:*:*:* | 2.9.11 alpha | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.11:beta:*:*:*:*:*:* | 2.9.11 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.11:pre-alpha:*:*:*:*:*:* | 2.9.11 pre-alpha | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.12:beta:*:*:*:*:*:* | 2.9.12 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.13:beta:*:*:*:*:*:* | 2.9.13 beta | Vulnerable | Privoxy |
- cpe:2.3:a:privoxy:privoxy:*:beta:*:*:*:*:*:* Versions up to 3.0.20 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.0:pre-alpha:*:*:*:*:*:* Versions 2.9.0 pre-alpha Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.1:pre-alpha:*:*:*:*:*:* Versions 2.9.1 pre-alpha Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.2:pre-alpha:*:*:*:*:*:* Versions 2.9.2 pre-alpha Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.3:pre-alpha:*:*:*:*:*:* Versions 2.9.3 pre-alpha Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.11:alpha:*:*:*:*:*:* Versions 2.9.11 alpha Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.11:beta:*:*:*:*:*:* Versions 2.9.11 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.11:pre-alpha:*:*:*:*:*:* Versions 2.9.11 pre-alpha Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.12:beta:*:*:*:*:*:* Versions 2.9.12 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.13:beta:*:*:*:*:*:* Versions 2.9.13 beta Vulnerable ·Privoxy
Show 21 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:privoxy:privoxy:2.9.14:beta:*:*:*:*:*:* | 2.9.14 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.16:*:*:*:*:*:*:* | 2.9.16 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:2.9.18:*:*:*:*:*:*:* | 2.9.18 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0:*:*:*:*:*:*:* | 3.0 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.2:*:*:*:*:*:*:* | 3.0.2 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.3:*:*:*:*:*:*:* | 3.0.3 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.5:beta:*:*:*:*:*:* | 3.0.5 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.6:*:*:*:*:*:*:* | 3.0.6 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.7:beta:*:*:*:*:*:* | 3.0.7 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.8:*:*:*:*:*:*:* | 3.0.8 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.9:beta:*:*:*:*:*:* | 3.0.9 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.10:*:*:*:*:*:*:* | 3.0.10 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.11:*:*:*:*:*:*:* | 3.0.11 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.12:*:*:*:*:*:*:* | 3.0.12 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.13:beta:*:*:*:*:*:* | 3.0.13 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.14:beta:*:*:*:*:*:* | 3.0.14 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.15:beta:*:*:*:*:*:* | 3.0.15 beta | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.16:*:*:*:*:*:*:* | 3.0.16 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.17:*:*:*:*:*:*:* | 3.0.17 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.18:*:*:*:*:*:*:* | 3.0.18 | Vulnerable | Privoxy |
| cpe:2.3:a:privoxy:privoxy:3.0.19:*:*:*:*:*:*:* | 3.0.19 | Vulnerable | Privoxy |
- cpe:2.3:a:privoxy:privoxy:2.9.14:beta:*:*:*:*:*:* Versions 2.9.14 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.16:*:*:*:*:*:*:* Versions 2.9.16 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:2.9.18:*:*:*:*:*:*:* Versions 2.9.18 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.2:*:*:*:*:*:*:* Versions 3.0.2 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.3:*:*:*:*:*:*:* Versions 3.0.3 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.5:beta:*:*:*:*:*:* Versions 3.0.5 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.6:*:*:*:*:*:*:* Versions 3.0.6 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.7:beta:*:*:*:*:*:* Versions 3.0.7 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.8:*:*:*:*:*:*:* Versions 3.0.8 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.9:beta:*:*:*:*:*:* Versions 3.0.9 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.10:*:*:*:*:*:*:* Versions 3.0.10 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.11:*:*:*:*:*:*:* Versions 3.0.11 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.12:*:*:*:*:*:*:* Versions 3.0.12 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.13:beta:*:*:*:*:*:* Versions 3.0.13 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.14:beta:*:*:*:*:*:* Versions 3.0.14 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.15:beta:*:*:*:*:*:* Versions 3.0.15 beta Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.16:*:*:*:*:*:*:* Versions 3.0.16 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.17:*:*:*:*:*:*:* Versions 3.0.17 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.18:*:*:*:*:*:*:* Versions 3.0.18 Vulnerable ·Privoxy
- cpe:2.3:a:privoxy:privoxy:3.0.19:*:*:*:*:*:*:* Versions 3.0.19 Vulnerable ·Privoxy
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2013-2503
- 2026-10-03 Alias added: GHSA-xwv2-6j43-gjcx
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-2013-2503 · CVE Program
- CVE-2013-2503 · NVD
- FIRST EPSS
- GHSA-xwv2-6j43-gjcx · GitHub Advisory Database · CC BY 4.0
- CVE-2013-2503 · 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