# CVE-2025-61962: fetchmail: In fetchmail before 6.5.6, the SMTP client can crash when authenticatingupon receiving a 334 status code in a malform...

CVE-2025-61962 is fixed in 3 products on 1 platform, first by fetchmail 6.4.27-1ubuntu0.1, released October 3, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-61962
- Priority: Routine
- CVSS: 5.9 (Medium)
- EPSS: 0.0041
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 3, 2025

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | fetchmail Debian 14 | 6.5.6-1 | [DEBIAN-CVE-2025-61962](https://patchblox.com/security/data/fix/linux/debian-cve-2025-61962.md) | Oct 4, 2025 |
| Linux | fetchmail Ubuntu 22.04.1 LTS (jammy) | 6.4.27-1ubuntu0.1 | [fetchmail 6.4.27-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-fetchmail-6.4.27-1ubuntu0.1.md) | Oct 3, 2025 |
| Linux | fetchmail Ubuntu 24.04.5 LTS (noble) | 6.4.38-1ubuntu4.1 | [fetchmail 6.4.38-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-fetchmail-6.4.38-1ubuntu4.1.md) | Oct 3, 2025 |
| Linux | fetchmail Ubuntu 25.04 (plucky) | 6.4.39-1ubuntu0.1 | [fetchmail 6.4.39-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-fetchmail-6.4.39-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | fetchmail Ubuntu 25.10 (questing) | 6.5.4-0ubuntu2 | [fetchmail 6.5.4-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-fetchmail-6.5.4-0ubuntu2.md) | Oct 3, 2025 |
| Linux | fetchmail Ubuntu 26.04.1 LTS (resolute) | 6.5.4-0ubuntu2 | [fetchmail 6.5.4-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-fetchmail-6.5.4-0ubuntu2.md) | Oct 3, 2025 |
| Linux | fetchmail amzn 2023 | 6.5.7-1.amzn2023 | [ALAS2023-2025-1292](https://patchblox.com/security/data/fix/linux/alas2023-2025-1292.md) | Dec 8, 2025 |
| Linux | fetchmail opensuse-leap 15.6 | 6.4.22-150600.35.3.1 | [SUSE-SU-2025:3845-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3845-1.md) | Oct 28, 2025 |
| Linux | fetchmail opensuse-leap 16.0 | 6.5.2-160000.3.1 | [OPENSUSE-SU-2026:20432-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20432-1.md) | Mar 26, 2026 |
| Linux | fetchmail sles 15.6 | 6.4.22-150600.35.3.1 | [SUSE-SU-2025:3845-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3845-1.md) | Oct 28, 2025 |
| Linux | fetchmail sles 15.7 | 6.4.22-150600.35.3.1 | [SUSE-SU-2025:3845-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3845-1.md) | Oct 28, 2025 |
| Linux | fetchmail sles 16.0 | 6.5.2-160000.3.1 | [SUSE-SU-2026:20935-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20935-1.md) | Mar 26, 2026 |
| Linux | fetchmail-debuginfo amzn 2023 | 6.5.7-1.amzn2023 | [ALAS2023-2025-1292](https://patchblox.com/security/data/fix/linux/alas2023-2025-1292.md) | Dec 8, 2025 |
| Linux | fetchmail-debugsource amzn 2023 | 6.5.7-1.amzn2023 | [ALAS2023-2025-1292](https://patchblox.com/security/data/fix/linux/alas2023-2025-1292.md) | Dec 8, 2025 |

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Data as of 2026-11-10T07:50:38Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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