What’s Vulnerable › Vulnerabilities

CVE-2005-0255

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2005-05-02 · updated 2026-06-16

Description

String handling functions in Mozilla 1.7.3, Firefox 1.0, and Thunderbird before 1.0.2, such as the nsTSubstring_CharT::Replace function, do not properly check the return values of other functions that resize the string, which allows remote attackers to cause a denial of service and possibly execute arbitrary code by forcing an out-of-memory state that causes a reallocation to fail and return a pointer to a fixed address, which leads to heap corruption.

Affected products

• Mozilla Firefox: 1.0
• Mozilla: 1.7.3
• Mozilla Thunderbird: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 (+4)

References

• http://secunia.com/advisories/19823
• http://www.gentoo.org/security/en/glsa/glsa-200503-10.xml
• http://www.gentoo.org/security/en/glsa/glsa-200503-30.xml
• http://www.idefense.com/application/poi/display?id=200&type=vulnerabilities
• http://www.mozilla.org/security/announce/mfsa2005-18.html
• http://www.novell.com/linux/security/advisories/2005_16_mozilla_firefox.html
• http://www.novell.com/linux/security/advisories/2006_04_25.html
• http://www.redhat.com/support/errata/RHSA-2005-176.html
• http://www.redhat.com/support/errata/RHSA-2005-277.html
• http://www.redhat.com/support/errata/RHSA-2005-337.html
• http://www.securityfocus.com/bid/12659
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100040

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