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Fencer Vulns
high 7.5

CVE-2005-2871 in the critical feed json

Buffer overflow in the International Domain Name (IDN) support in Mozilla Firefox 1.0.6 and earlier, and Netscape 8.0.3.3 and 7.2, allows r…

published 2005-09-09 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-2872

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
21.1%
EPSS 21.1% chance of exploitation in 30 days, percentile 97%
public exploits
1
Exploit-DB

Summary

Buffer overflow in the International Domain Name (IDN) support in Mozilla Firefox 1.0.6 and earlier, and Netscape 8.0.3.3 and 7.2, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a hostname with all "soft" hyphens (character 0xAD), which is not properly handled by the NormalizeIDN call in nsStandardURL::BuildNormalizedSpec.

Patch / fix

  • thunderbird RHEL 4 1.0.7-1.4.1
  • firefox RHEL 4 1.0.6-1.4.2

red hat advisories RHSA-2005:791RHSA-2005:768

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-2005-2871 updated

security flaw

  • Red Hat Enterprise Linux AS version 4 firefox 1.0.6-1.4.2, thunderbird 1.0.7-1.4.1 Red Hat Enterprise Linux Desktop version 4 firefox 1.0.6-1.4.2, thunderbird 1.0.7-1.4.1 Red Hat Enterprise Linux ES version 4 firefox 1.0.6-1.4.2, thunderbird 1.0.7-1.4.1 Red Hat Enterprise Linux WS version 4 firefox 1.0.6-1.4.2, thunderbird 1.0.7-1.4.1
    fixed: vendor fix RHSA-2005:768

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. Published
  2. First public exploit (EDB-1224)

Exploit prediction

21.11% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-1224 Mozilla Browsers - 0xAD (HOST:) Remote Heap Buffer Overrun (2) remote, 2005-09-22
  • security-protocols.com http://www.security-protocols.com/advisory/sp-x17-advisory.txt referenced PoC, tagged "exploit" by a source, unverified
  • security-protocols.com http://www.security-protocols.com/firefox-death.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

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.