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CVE-2025-61600— Unbounded Memory Allocation in Stalwart IMAP parser

Quick assessment

Affected
stalwartlabs stalwart
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

stalwart是Stalwart Labs开源的一个多功能邮件和协作服务器。 Stalwart 0.13.3及之前版本存在安全漏洞，该漏洞源于IMAP协议解析器中多个状态处理程序缺少验证检查，可能导致无界内存分配，从而触发系统内存不足杀手并导致拒绝服务。

CVSS 7.5 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-61600

Vulnerability Information
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Vulnerability Title
Unbounded Memory Allocation in Stalwart IMAP parser
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Stalwart 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
stalwart是Stalwart Labs开源的一个多功能邮件和协作服务器。 Stalwart 0.13.3及之前版本存在安全漏洞，该漏洞源于IMAP协议解析器中多个状态处理程序缺少验证检查，可能导致无界内存分配，从而触发系统内存不足杀手并导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
stalwartlabs stalwart < 0.13.4 -

II. Public POCs for CVE-2025-61600

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7550 chars
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POC zip download
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III. Intelligence Information for CVE-2025-61600

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Patches & Fixes for CVE-2025-61600 (1)

Vendor Advisories for CVE-2025-61600 (1)

Vendor Pages for CVE-2025-61600 (1)

IV. Related Vulnerabilities

Same product: stalwart
Same vendor: stalwartlabs
Same weakness: CWE-400

V. Comments for CVE-2025-61600

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