How severe is CVE-2013-2028?

No CVSS score has been assigned to CVE-2013-2028 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-2028?

Affected package information for CVE-2013-2028 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2013-2028?

No fixed version has been published for CVE-2013-2028 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2013-2028 actively exploited in the wild?

Yes. There are 14 known exploit references for CVE-2013-2028, including 5 documented proof-of-concept exploits on Exploit-DB and 5 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2013-2028?

CVE-2013-2028 has an EPSS (Exploit Prediction Scoring System) score of 93.0%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2013-2028?

CVE-2013-2028 is classified as Out-of-bounds Write (CWE-787). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2013-2028?

CVE-2013-2028 affects f5 nginx; fedoraproject fedora (1 version, e.g. 19). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2013-2028 published, and has it been updated?

CVE-2013-2028 was published on July 20, 2013 and was last updated on April 29, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2013-2028

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…

Published

Jul 20, 2013

Updated

Apr 29, 2026

Affected

0 pkgs

Patched

None yet

Exploits

14 known

EPSS Exploitation Probability

via FIRST.org ↗

93.0%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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

2 products · 2 configurations

Application

nginxf5

≥ 1.3.9 && ≤ 1.4.0

range

fedorafedoraproject

1 version

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-26737remotelinux_x86

Nginx 1.3.9/1.4.0 (x86) - Brute Force

by kingcope · Jul 11, 2013

Exploit-DB Source

EDB-25499doslinux

Nginx 1.3.9 < 1.4.0 - Denial of Service (PoC)

by Mert SARICA · May 17, 2013

Exploit-DB Source

EDB-25775remotelinux✓ Verified

Nginx 1.3.9 < 1.4.0 - Chuncked Encoding Stack Buffer Overflow (Metasploit)

by Metasploit · May 28, 2013

Exploit-DB Source

EDB-32277remotelinux_x86-64

Nginx 1.4.0 (Generic Linux x64) - Remote Overflow

by sorbo · Mar 15, 2014

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2013-2028 in your stack?

O3 detects CVE-2013-2028 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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