CVE•Published 2026-04-30•Modified 2026-05-01•0 articles on news•5 live references•NVD data

CVE-2026-40687Exim · Exim

Vulnerability data via NVD (ingested)

CVSS v3.1

4.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

EPSS percentile

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Weaknesses (CWE)

CWE-909Missing Initialization of Resource

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.

Timeline

Published 2026-04-30

Modified 2026-05-01

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag431,686 hosts

vuln:CVE-2026-40687

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Exim Exim"

All exposed Exim Exim instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Exim"

HTTP body or banner mentions "Exim" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-40687