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Fencer Vulns
high 7.5

CVE-2009-3586 json

Off-by-one error in src/http.c in CoreHTTP 0.5.3.1 and earlier allows remote attackers to cause a denial of service or possibly execute arb…

published 2009-12-08 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3567

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.4%
EPSS 6.4% chance of exploitation in 30 days, percentile 93%
public exploits
1
Exploit-DB

Summary

Off-by-one error in src/http.c in CoreHTTP 0.5.3.1 and earlier allows remote attackers to cause a denial of service or possibly execute arbitrary code via an HTTP request with a long first line that triggers a buffer overflow. NOTE: this vulnerability reportedly exists because of an incorrect fix for CVE-2007-4060.

Patch / fix

Timeline

  1. First public exploit (EDB-10349)
  2. Published

Exploit prediction

6.39% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-10349 CoreHTTP Web server 0.5.3.1 - Off-by-One Buffer Overflow dos, 2009-12-02
  • census-labs.com http://census-labs.com/media/corex.txt referenced PoC, tagged "exploit" by a source, unverified
  • census-labs.com http://census-labs.com/news/2009/12/02/corehttp-web-server/ 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

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.