# Exim vulnerabilities & exploitation

> As of 2026-10-05, Threadlinqs tracks 5 Exim CVEs, 0 in the CISA Known Exploited Vulnerabilities catalog, linked to 2 tracked threat campaigns.

**Data as of:** 2026-10-05

## Exploitation timeline

Threadlinqs has recorded 5 Exim CVEs published between 2026-05-15 and 2026-09-15. The busiest month was 2026-09 (4 new CVEs). None of them is listed in CISA KEV yet.

## Most exploited vulnerabilities

Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 5 of 5 tracked Exim CVEs.

- [CVE-2026-94055](https://intel.threadlinqs.com/cve/CVE-2026-94055) — LOW 3.7 · EPSS 0.3% · 2026-09-19
- [CVE-2026-94054](https://intel.threadlinqs.com/cve/CVE-2026-94054) — HIGH 7 · EPSS 0.3% · 2026-09-19
- [CVE-2026-94056](https://intel.threadlinqs.com/cve/CVE-2026-94056) — HIGH 7.5 · EPSS 0.2% · 2026-09-19
- [CVE-2026-94057](https://intel.threadlinqs.com/cve/CVE-2026-94057) — MEDIUM 4 · EPSS 0.2% · 2026-09-19
- [CVE-2026-45185](https://intel.threadlinqs.com/cve/CVE-2026-45185) — CRITICAL 9.8 · EPSS 0.1% · 2026-05-12

## Products affected

Threadlinqs normalises CPE and CNA product records across all 5 CVEs; 1 distinct Exim product is affected. The most frequently affected:

- Exim — 5 CVEs

## Threat activity

2 tracked threat campaigns reference Exim products or exploit Exim CVEs:

- [Exim Directory Traversal (CVE-2026-66140, CVSS 8.4) and .forward Privilege Escalation (CVE-2026-66141, CVSS 7.4) Enable Local Privilege Escalation via Queue-Name Argument and force_command Abuse](https://intel.threadlinqs.com/threat/TL-2026-1692) — HIGH — 2026-07-25
- [Dead.Letter — CVE-2026-45185 Unauthenticated Pre-Auth RCE in Exim via Use-After-Free in BDAT/GnuTLS](https://intel.threadlinqs.com/threat/TL-2026-0513) — CRITICAL — 2026-05-13

## How to prioritise Exim patching

This order follows the data Threadlinqs holds for Exim, not a generic severity checklist:

- No Exim CVE is in CISA KEV yet, so rank by exploit probability instead.
- Outside KEV, the highest EPSS scores are [CVE-2026-94055](https://intel.threadlinqs.com/cve/CVE-2026-94055) (0.3%), [CVE-2026-94054](https://intel.threadlinqs.com/cve/CVE-2026-94054) (0.3%), [CVE-2026-94056](https://intel.threadlinqs.com/cve/CVE-2026-94056) (0.2%).
- 1 CVE scores Critical and 2 High on CVSS v3 (maximum 9.8, average 6.4); sequence these after KEV and high-EPSS items.

## About this data

Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-05 and refresh daily.

Canonical: https://intel.threadlinqs.com/vendors/exim
All vendors: https://intel.threadlinqs.com/vendors
Full detection coverage and IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp