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Fencer Vulns
medium 4.3

CVE-2009-1232 json

Mozilla Firefox 3.0.8 and earlier 3.0.x versions allows remote attackers to cause a denial of service (memory corruption) via an XML docume…

published 2009-04-02 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1231

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.5%
EPSS 5.5% chance of exploitation in 30 days, percentile 92%
public exploits
1
Exploit-DB

Summary

Mozilla Firefox 3.0.8 and earlier 3.0.x versions allows remote attackers to cause a denial of service (memory corruption) via an XML document composed of a long series of start-tags with no corresponding end-tags. NOTE: it was later reported that 3.0.10 and earlier are also affected.

Timeline

  1. First public exploit (EDB-8306)
  2. Published

Exploit prediction

5.47% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-8306 Mozilla Firefox 3.0.x - XML Parser Memory Corruption / Denial of Service (PoC) dos, 2009-03-30
  • securityfocus.com http://www.securityfocus.com/bid/34522 referenced PoC, tagged "exploit" by a source, unverified
  • milw0rm.com http://milw0rm.com/sploits/2009-Firefox-XUL-0day-PoC.rar referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

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.