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Fencer Vulns
high 7.5

CVE-2013-2028 in the critical feed json

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 serv…

published 2013-07-18 13 y ago modified 2026-06-16 4 mo ago also EUVD-2013-2015

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
87.5%
EPSS 87.5% chance of exploitation in 30 days, percentile 99.7%
public exploits
5
Metasploit, Exploit-DB

Summary

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.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-2028 updated cvss 5.0

nginx: Stack-based buffer overflow when handling certain chunked transfer encoding requests

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit exploit/linux/http/nginx_chunked_size)
  2. Published

Exploit prediction

87.48% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/linux/http/nginx_chunked_size Nginx HTTP Server 1.3.9-1.4.0 Chunked Encoding Stack Buffer Overflow metasploit exploit, great rank, 2013-05-07
  • EDB-32277 Nginx 1.4.0 (Generic Linux x64) - Remote Overflow remote, 2014-03-15
  • EDB-26737 Nginx 1.3.9/1.4.0 (x86) - Brute Force remote, 2013-07-11
  • EDB-25775 Nginx 1.3.9 < 1.4.0 - Chuncked Encoding Stack Buffer Overflow (Metasploit) remote, 2013-05-28
  • EDB-25499 Nginx 1.3.9 < 1.4.0 - Denial of Service (PoC) dos, 2013-05-17
  • packetstormsecurity.com http://packetstormsecurity.com/files/121675/Nginx-1.3.9-1.4.0-Denial-Of-Service.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.