The ngx_http_parse_chunked function in http/ngx_http_parse.c in nginx 1.3.9 through 1.4.0 allows remote attackers to cause a denial of service (crash) and execute arbitrary code via a chunked Transfer-Encoding request with a large chunk size, which triggers an integer signedness error and a stack-based buffer overflow
Published Jul 18, 2013
7.5
HIGHCVSS 2.0
EPSS 87.48%
Description
The ngx_http_parse_chunked function in http/ngx_http_parse.c in nginx 1.3.9 through 1.4.0 allows remote attackers to cause a denial of service (crash) and execute arbitrary code via a chunked Transfer-Encoding request with a large chunk size, which triggers an integer signedness error and a stack-based buffer overflow.
Affected products
No data.
Configuration 2
- 19
No data.
No Red Hat product state for this CVE.
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:L/Au:N/C:P/I:P/A:P
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 2, 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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 87.48% (0.87475) | 99.75th | v5 (v2026.06.15) |
| Jun 15, 2026 | 87.48% (0.87475) | 99.73th | v5 (v2026.06.15) |
| May 18, 2025 | 92.53% (0.92530) | 99.72th | v4 (v2025.03.14) |
| Apr 15, 2025 | 91.39% (0.91388) | 99.63th | v4 (v2025.03.14) |
| Mar 17, 2025 | 92.97% (0.92971) | 99.77th | v4 (v2025.03.14) |
| Feb 15, 2025 | 57.89% (0.57886) | 97.91th | v3 (v2023.03.01) |
| Dec 17, 2024 | 63.12% (0.63124) | 97.99th | v3 (v2023.03.01) |
| Jun 7, 2024 | 15.16% (0.15160) | 95.85th | v3 (v2023.03.01) |
| Sep 3, 2023 | 11.66% (0.11664) | 94.56th | v3 (v2023.03.01) |
| Jul 16, 2023 | 10.36% (0.10359) | 94.20th | v3 (v2023.03.01) |
| Apr 13, 2023 | 10.90% (0.10899) | 94.21th | v3 (v2023.03.01) |
| Mar 7, 2023 | 8.98% (0.08980) | 93.58th | v3 (v2023.03.01) |
| Mar 6, 2023 | 81.90% (0.81899) | 99.55th | v2 (v2022.01.01) |
| Feb 4, 2022 | 81.90% (0.81899) | 99.46th | v2 (v2022.01.01) |
References (10)
- http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105176.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://mailman.nginx.org/pipermail/nginx-announce/2013/000112.html mailing-listx_refsource_MLISTMitigationPatchVendor Advisory
- http://nginx.org/download/patch.2013.chunked.txt x_refsource_MISCPatchVendor Advisory
- http://packetstormsecurity.com/files/121675/Nginx-1.3.9-1.4.0-Denial-Of-Service.html x_refsource_MISCExploitThird Party AdvisoryVDB Entry
- http://secunia.com/advisories/55181 third-party-advisoryx_refsource_SECUNIAThird Party Advisory
- http://security.gentoo.org/glsa/glsa-201310-04.xml vendor-advisoryx_refsource_GENTOOThird Party Advisory
- http://www.osvdb.org/93037 vdb-entryx_refsource_OSVDBBroken Link
- http://www.securityfocus.com/bid/59699 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.vnsecurity.net/2013/05/analysis-of-nginx-cve-2013-2028/ x_refsource_MISCBroken Link
- https://github.com/rapid7/metasploit-framework/pull/1834 x_refsource_MISCPatchThird Party Advisory
Change history (0)
No recorded changes yet.