CVE-2005-0021

Name: CVE-2005-0021
Creator: NVD / NIST
Published: 2005-05-02T04:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.62%

Last modified Jun 16, 2026

CVE-2005-0021 is a vulnerability of currently unknown severity. Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.. EPSS estimates a 2.62% chance of exploitation in the next 30 days.

Description

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Metrics

EPSS Probability

2.62%

83.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
University Of Cambridge	Exim	<= 4.40
University Of Cambridge	Exim	4.41
University Of Cambridge	Exim	4.42

References

http://ftp6.us.freebsd.org/pub/mail/exim/ChangeLogs/ChangeLog-4.44
http://security.gentoo.org/glsa/glsa-200501-23.xmlVendor Advisory
http://www.debian.org/security/2005/dsa-635Vendor Advisory
http://www.debian.org/security/2005/dsa-637Vendor Advisory
http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20050103/msg00028.html
http://www.idefense.com/application/poi/display?id=179&type=vulnerabilitiesVendor Advisory
http://www.idefense.com/application/poi/display?id=183&type=vulnerabilitiesExploit, Vendor Advisory
http://www.kb.cert.org/vuls/id/132992Patch, US Government Resource
http://www.redhat.com/support/errata/RHSA-2005-025.htmlPatch
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10347
http://ftp6.us.freebsd.org/pub/mail/exim/ChangeLogs/ChangeLog-4.44
http://security.gentoo.org/glsa/glsa-200501-23.xmlVendor Advisory
http://www.debian.org/security/2005/dsa-635Vendor Advisory
http://www.debian.org/security/2005/dsa-637Vendor Advisory
http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20050103/msg00028.html
http://www.idefense.com/application/poi/display?id=179&type=vulnerabilitiesVendor Advisory
http://www.idefense.com/application/poi/display?id=183&type=vulnerabilitiesExploit, Vendor Advisory
http://www.kb.cert.org/vuls/id/132992Patch, US Government Resource
http://www.redhat.com/support/errata/RHSA-2005-025.htmlPatch
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10347

Timeline

Published: May 2, 2005
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2005-0021?

How severe is CVE-2005-0021?

Severity scoring for CVE-2005-0021 is pending analysis. The EPSS model estimates a 2.62% probability of exploitation in the next 30 days.

How do I fix CVE-2005-0021?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2005-0021?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST