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.
Conclusion & alert: CVE-2013-2028 is rated High Exploit Risk (79.9/100): CVSS High severity, with high exploitation likelihood (EPSS 93.04%, 100th percentile). Core evidence: 5 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| 32277 | exploit_db | edb | 2014-03-15 | Exploit-DB ↗ |
| 26737 | exploit_db | edb | 2013-07-11 | Exploit-DB ↗ |
| 25775 | exploit_db | edb | 2013-05-28 | Exploit-DB ↗ |
| 25499 | exploit_db | edb | 2013-05-17 | Exploit-DB ↗ |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-24 | 93.07% | 93.04% | -0.03% |
| 2 | 2026-04-21 | 93.04% | 93.07% | +0.03% |
| 3 | 2026-04-10 | — | 93.04% | — |
Full EPSS history (28 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2013-2028 unimportant priority: Debian including 1 source packages (nginx), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2013-2028 |
gentoo
|
normal | CVE-2013-2028: 1 GLSA(s) (201310-04), 1 atom(s) (www-servers/nginx); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-2028 |
suse
|
high | CVE-2013-2028 severity important: SUSE including 2 source package names (nginx, nginx-1.0), 6 product×package rows across 6 product lines (SUSE Lifecycle Management Server 1.3, SUSE Linux Enterprise High Performance Computing 15-LTSS, … (6 product lines)): Known Not Affected 6. | https://www.suse.com/security/cve/CVE-2013-2028/ |
ubuntu
|
high | CVE-2013-2028 high priority: Ubuntu including 1 source packages (nginx), 7 status rows across 7 suites (hardy, lucid, oneiric, precise, quantal, raring, upstream): not-affected 6, released 1. | https://ubuntu.com/security/CVE-2013-2028 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| f5 | nginx | >= 1.3.9, <= 1.4.0 | cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 19 | cpe:2.3:o:fedoraproject:fedora:19:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105176.html | Third Party Advisory |
| http://mailman.nginx.org/pipermail/nginx-announce/2013/000112.html | Mitigation Patch Vendor Advisory |
| http://nginx.org/download/patch.2013.chunked.txt | Patch Vendor Advisory |
| http://packetstormsecurity.com/files/121675/Nginx-1.3.9-1.4.0-Denial-Of-Service.html | Exploit Third Party Advisory VDB Entry |
| http://secunia.com/advisories/55181 | Third Party Advisory |
| http://security.gentoo.org/glsa/glsa-201310-04.xml | Third Party Advisory |
| http://www.osvdb.org/93037 | Broken Link |
| http://www.securityfocus.com/bid/59699 | Third Party Advisory VDB Entry |
| http://www.vnsecurity.net/2013/05/analysis-of-nginx-cve-2013-2028/ | Broken Link |
| https://github.com/rapid7/metasploit-framework/pull/1834 | Patch Third Party Advisory |