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CVE-2025-61600

7.5 · HIGH

Stalwart is a mail and collaboration server.

Published Oct 2, 2025CWE-400EPSS 0.56%

Overview

CVE-2025-61600 is a high-severity vulnerability. It was published on October 2, 2025 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

Stalwart is a mail and collaboration server. Versions 0.13.3 and below contain an unbounded memory allocation vulnerability in the IMAP protocol parser which allows remote attackers to exhaust server memory, potentially triggering the system's out-of-memory (OOM) killer and causing a denial of service. The CommandParser implementation enforces size limits on its dynamic buffer in most parsing states, but several state handlers omit these validation checks. This issue is fixed in version 0.13.4. A workaround for this issue is to implement rate limiting and connection monitoring at the network level, however this does not provide complete protection.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

GitHubgithub.com/stalwartlabs/stalwart/commit/a8e631e881bded8128358732f18e02ca94a4e677GitHubgithub.com/stalwartlabs/stalwart/releases/tag/v0.13.4GitHubgithub.com/stalwartlabs/stalwart/security/advisories/GHSA-8jqj-qj5p-v5rr

How CyberStrike helps

Frequently asked questions

What is CVE-2025-61600?

CVE-2025-61600 is a high-severity vulnerability. It was published on October 2, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-61600?

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-2025-61600?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2025-61600?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-61600 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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