In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a malformed context.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2025-1292 advisory.

    In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code     in a malformed context. (CVE-2025-61962)

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

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

The remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2025:3966-1 advisory.

    - CVE-2025-61962: fixed a denial of service condition (bsc#1251194)

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

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

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2025:0837 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2025-61962:
    In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code     in a malformed context.

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

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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:3845-1 advisory.

    - CVE-2025-61962: fixed a denial of service condition (bsc#1251194)

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

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

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-891d4dd5d6 advisory.

    Update to fetchmail-6.5.6 (CVE-2025-61962)

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

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

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.04 host has a package installed that is affected by a vulnerability as referenced in the USN-7838-1 advisory.

    It was discovered that the fetchmail SMTP client incorrectly handled certain status code messages. An     attacker controlling a malicious server could possibly use this issue to cause fetchmail to crash,     resulting in a denial of service.

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

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

The remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-ab3c40c1f4 advisory.

    Update to fetchmail-6.5.6 (CVE-2025-61962)

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

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

The remote Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-fa8d0fb866 advisory.

    Update to fetchmail-6.5.6 (CVE-2025-61962)

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

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code     in a malformed context. (CVE-2025-61962)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 21fba35e-a05f-11f0-a8b8-a1ef31191bc1 advisory.

    Matthias Andree reports:

                fetchmail's SMTP client, when configured to authenticate, is                 susceptible to a protocol violation where, when a trusted but                 malicious or malfunctioning SMTP server responds to an                 authentication request with a 334 code but without a following                 blank on the line, it will attempt to start reading from memory                 address 0x1 to parse the server's SASL challenge. This address is                 constant and not under the attacker's control. This event will                 usually cause a crash of fetchmail.


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

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

ID	Name	Product	Family	Severity
277817	Amazon Linux 2023 : fetchmail (ALAS2023-2025-1292)	Nessus	Amazon Linux Local Security Checks	medium
274381	SUSE SLES12 Security Update : fetchmail (SUSE-SU-2025:3966-1)	Nessus	SuSE Local Security Checks	medium
272253	TencentOS Server 4: fetchmail (TSSA-2025:0837)	Nessus	Tencent Local Security Checks	medium
271945	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : fetchmail (SUSE-SU-2025:3845-1)	Nessus	SuSE Local Security Checks	medium
271472	Fedora 43 : fetchmail (2025-891d4dd5d6)	Nessus	Fedora Local Security Checks	medium
271397	Ubuntu 22.04 LTS / 24.04 LTS / 25.04 : fetchmail vulnerability (USN-7838-1)	Nessus	Ubuntu Local Security Checks	medium
270737	Fedora 42 : fetchmail (2025-ab3c40c1f4)	Nessus	Fedora Local Security Checks	medium
270730	Fedora 41 : fetchmail (2025-fa8d0fb866)	Nessus	Fedora Local Security Checks	medium
269446	Linux Distros Unpatched Vulnerability : CVE-2025-61962	Nessus	Misc.	medium
266471	FreeBSD : fetchmail -- potential crash when authenticating to SMTP server (21fba35e-a05f-11f0-a8b8-a1ef31191bc1)	Nessus	FreeBSD Local Security Checks	medium

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CVE-2025-61962

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