privoxy: Proxy-Authentication response spoofing
Published Mar 11, 2013
5.8
MEDIUMCVSS 2.0
EPSS 4.63%
Description
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.
Affected products
No data.
- ≤ 3.0.20
- 2.9.0
- 2.9.1
- 2.9.2
- 2.9.3
- 2.9.11
- 2.9.11
- 2.9.11
- 2.9.12
- 2.9.13
- 2.9.14
- 2.9.16
- 2.9.18
- 3.0
- 3.0.2
- 3.0.3
- 3.0.5
- 3.0.6
- 3.0.7
- 3.0.8
- 3.0.9
- 3.0.10
- 3.0.11
- 3.0.12
- 3.0.13
- 3.0.14
- 3.0.15
- 3.0.16
- 3.0.17
- 3.0.18
- 3.0.19
No data.
Red Hat Enterprise Linux 5
privoxy
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | privoxy | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.63% (0.04632) | 91.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.63% (0.04632) | 90.49th | v5 (v2026.06.15) |
| Jul 13, 2025 | 3.48% (0.03483) | 87.06th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.02% (0.02020) | 82.14th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.80% (0.03797) | 79.92th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.02% (0.02020) | 82.56th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.79% (0.00792) | 82.26th | v3 (v2023.03.01) |
| Jun 4, 2024 | 1.44% (0.01437) | 86.61th | v3 (v2023.03.01) |
| Apr 4, 2024 | 1.96% (0.01962) | 88.49th | v3 (v2023.03.01) |
| Sep 27, 2023 | 2.44% (0.02445) | 88.71th | v3 (v2023.03.01) |
| Jun 15, 2023 | 2.71% (0.02707) | 88.99th | v3 (v2023.03.01) |
| Mar 10, 2023 | 2.82% (0.02823) | 89.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.32% (0.02321) | 87.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.98% (0.04979) | 89.53th | v2 (v2022.01.01) |
| Feb 22, 2023 | 4.98% (0.04979) | 89.33th | v2 (v2022.01.01) |
| Nov 20, 2022 | 6.03% (0.06033) | 90.27th | v2 (v2022.01.01) |
| Aug 13, 2022 | 6.46% (0.06464) | 90.58th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.03% (0.07032) | 91.51th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.03% (0.07032) | 80.01th | v2 (v2022.01.01) |
References (7)
- http://blog.c22.cc/2013/03/11/privoxy-proxy-authentication-credential-exposure-cve-2013-2503/ x_refsource_MISCExploit
- http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/ChangeLog?revision=1.188&view=markup x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-updates/2013-03/msg00118.html vendor-advisoryx_refsource_SUSE
- https://access.redhat.com/security/cve/CVE-2013-2503 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=920643 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2013-2503
- https://www.cve.org/CVERecord?id=CVE-2013-2503
| Link | Providers | Tags |
|---|---|---|
| http://blog.c22.cc/2013/03/11/privoxy-proxy-authentication-credential-exposure-cve-2013-2503/ | x_refsource_MISCExploit | |
| http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/ChangeLog?revision=1.188&view=markup | x_refsource_CONFIRM | |
| http://lists.opensuse.org/opensuse-updates/2013-03/msg00118.html | vendor-advisoryx_refsource_SUSE | |
| https://access.redhat.com/security/cve/CVE-2013-2503 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=920643 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2013-2503 | ||
| https://www.cve.org/CVERecord?id=CVE-2013-2503 |
Change history (0)
No recorded changes yet.