CVE•Published 2026-05-12•Modified 2026-05-28•1 article on news•6 live references•NVD data

CVE-2026-45185Exim · Exim

Vulnerability data via NVD (ingested)

CVSS v3.1

9.8

CRITICAL

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

EPSS percentile

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Weaknesses (CWE)

CWE-416Use After Free

Description

Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.

Timeline

Published 2026-05-12

Modified 2026-05-28

External references

NVD MITRE Exploit-DB Sploitus trickest/cve 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 tag134,397 hosts

vuln:CVE-2026-45185

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-2026-45185