CVE-2005-0021

Severity: high (CVSS 7.2 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2005-05-02 · updated 2026-06-16

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.

Affected products

University of Cambridge Exim: through 4.40; 4.41, 4.42

References

http://ftp6.us.freebsd.org/pub/mail/exim/ChangeLogs/ChangeLog-4.44
http://security.gentoo.org/glsa/glsa-200501-23.xml
http://www.debian.org/security/2005/dsa-635
http://www.debian.org/security/2005/dsa-637
http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20050103/msg00028.html
http://www.idefense.com/application/poi/display?id=179&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=183&type=vulnerabilities
http://www.kb.cert.org/vuls/id/132992
http://www.redhat.com/support/errata/RHSA-2005-025.html
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.xml

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