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CVE-2006-4434

7.5 · HIGH

Use-after-free vulnerability in Sendmail before 8.13.8 allows remote attackers to cause a denial of service (crash) via a long "header line", which causes a previously freed variable to be referenced.

Published Aug 29, 2006sendmailCWE-416EPSS 4.55%

Overview

CVE-2006-4434 is a high-severity vulnerability affecting sendmail sendmail. It was published on August 29, 2006 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Use-after-free vulnerability in Sendmail before 8.13.8 allows remote attackers to cause a denial of service (crash) via a long "header line", which causes a previously freed variable to be referenced. NOTE: the original developer has disputed the severity of this issue, saying "The only denial of service that is possible here is to fill up the disk with core dumps if the OS actually generates different core dumps (which is unlikely)... the bug is in the shutdown code (finis()) which leads directly to exit(3), i.e., the process would terminate anyway, no mail delivery or receiption is affected."

Remediation

Check the references section for vendor advisories and patches from sendmail. Update sendmail 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
sendmailsendmail>= 0, < 8.13.8Affected

References

Refsecunia.com/advisories/21637Refsecunia.com/advisories/21641Refsecunia.com/advisories/21696Refsecunia.com/advisories/21700Refsecunia.com/advisories/21749Refsecunia.com/advisories/22369Refsecuritytracker.com/id?1016753Refsunsolve.sun.com/search/document.do?assetkey=1-26-102664-1Refwww.attrition.org/pipermail/vim/2006-August/000999.htmlRefwww.debian.org/security/2006/dsa-1164

How CyberStrike helps

Frequently asked questions

What is CVE-2006-4434?

CVE-2006-4434 is a high-severity vulnerability affecting sendmail sendmail. It was published on August 29, 2006 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2006-4434?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2006-4434?

Check the references section for vendor advisories and patches from sendmail. Update sendmail 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-2006-4434?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2006-4434 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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