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CVE-2005-0021

7.2 · HIGH

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, w…

Published May 2, 2005university_of_cambridgeEPSS 2.62%

Overview

CVE-2005-0021 is a high-severity vulnerability affecting university_of_cambridge exim. It was published on May 2, 2005 and has a CVSS 2.0 base score of 7.2 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.2, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from university_of_cambridge. Update exim to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
university_of_cambridgeexim0Affected

References

Refftp6.us.freebsd.org/pub/mail/exim/ChangeLogs/ChangeLog-4.44Refsecurity.gentoo.org/glsa/glsa-200501-23.xmlRefwww.debian.org/security/2005/dsa-635Refwww.debian.org/security/2005/dsa-637Refwww.exim.org/mail-archives/exim-users/Week-of-Mon-20050103/msg00028.htmlRefwww.idefense.com/application/poi/display?id=179&type=vulnerabilitiesRefwww.idefense.com/application/poi/display?id=183&type=vulnerabilitiesRefwww.kb.cert.org/vuls/id/132992Refwww.redhat.com/support/errata/RHSA-2005-025.htmlRefoval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10347

How CyberStrike helps

Frequently asked questions

What is CVE-2005-0021?

CVE-2005-0021 is a high-severity vulnerability affecting university_of_cambridge exim. It was published on May 2, 2005 and has a CVSS 2.0 base score of 7.2 (HIGH).

How severe is CVE-2005-0021?

This vulnerability has a CVSS 2.0 base score of 7.2, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2005-0021?

Check the references section for vendor advisories and patches from university_of_cambridge. Update exim to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2005-0021?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2005-0021 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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