Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-40687

Quick assessment

Affected
Exim Exim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Exim是Exim开源的一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim 4.99.2之前版本存在安全漏洞，该漏洞源于SPA认证驱动程序处理对抗性SPA资源时，可能导致越界写入导致连接实例崩溃，或错误数据处理泄露未初始化堆内存数据。

CVSS 4.8 · Medium EPSS 0.67% · P50

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 1

VendorProduct Version RangeStatus
Exim Exim < 4.99.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-40687

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
资源初始化缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Exim 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Exim是Exim开源的一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim 4.99.2之前版本存在安全漏洞，该漏洞源于SPA认证驱动程序处理对抗性SPA资源时，可能导致越界写入导致连接实例崩溃，或错误数据处理泄露未初始化堆内存数据。
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
Exim Exim 0 ~ 4.99.2 -

II. Public POCs for CVE-2026-40687

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-40687

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-40687 (1)

Mailing List Discussions for CVE-2026-40687 (1)

Other References for CVE-2026-40687 (2)

Other References for CVE-2026-40687 (1)

Same Patch Batch · Exim · 2026-04-30 · 4 CVEs total

CVE-2026-40685 6.5 MEDIUM Exim 缓冲区错误漏洞
CVE-2026-40684 5.9 MEDIUM Exim 安全漏洞
CVE-2026-40686 3.7 LOW Exim 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: Exim
Same vendor: Exim
Same weakness: CWE-909

V. Comments for CVE-2026-40687

No comments yet

Leave a comment