Off-by-one buffer overflow in Dovecot 1.0test53 through 1.0.rc14, and possibly other versions, when index files are used and mmap_disable is set to "yes," allows remote authenticated IMAP or POP3 users to cause a denial of service (crash) via unspecified vectors involving the cache file.

The CentOS Linux 7.9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_1758 advisory.

    This advisory aggregates security fixes for the dovecot SRPM in CIQ CentOS Bridge 7.9. It addresses 11     CVEs: CVE-2019-11500, CVE-2026-27858, CVE-2019-7524, CVE-2019-3814, CVE-2006-5973, and 6 more.

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 8.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_0035 advisory.

    This advisory aggregates security fixes for the dovecot SRPM in CIQ LTS 8.6. It addresses 21 CVEs:
    CVE-2019-11500, CVE-2020-24386, CVE-2020-25275, CVE-2020-12100, CVE-2017-14461, and 16 more.

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Dovecot was discovered to have an error when handling its index cache files. This error could be exploited by authenticated POP and IMAP users to cause a crash of the Dovecot server, or possibly to execute arbitrary code. Only servers using the non-default option 'mmap_disable=yes' were vulnerable.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Off-by-one buffer overflow in Dovecot 1.0 versions, when index files are used and mmap_disable is set to 'yes,' allows remote authenticated IMAP or POP3 users to cause a denial of service (crash) via unspecified vectors involving the cache file. (CVE-2006-5973)

ID	Name	Product	Family	Type	Severity
376415	CentOS Linux 7.9 [CIQ] Security Update: dovecot / dovecot-devel / dovecot-mysql / dovecot-pgsql / etc Multiple Vulnerabilities (ciqsa-2026_1758)	Nessus	CentOS Local Security Checks	Local	critical
357898	Rocky Linux 8.6 [CIQ] Security Update: dovecot / dovecot-debuginfo / dovecot-debugsource / dovecot-devel / etc Multiple Vulnerabilities (ciqsa-2026_0035)	Nessus	Rocky Linux Local Security Checks	Local	critical
27970	Ubuntu 6.06 LTS / 6.10 : dovecot vulnerability (USN-387-1)	Nessus	Ubuntu Local Security Checks	Local	medium
27201	openSUSE 10 Security Update : dovecot (dovecot-2306)	Nessus	SuSE Local Security Checks	Local	medium

Detections

Analytics

CVE-2006-5973

medium

Tenable Plugins

critical

critical

medium

medium