# Exim vulnerabilities

Source: https://junglewise.ai/threats/vendors/exim  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 12 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/exim.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 19 vulnerabilities in Exim: 0 in the last 7 days and 4 in the last 90 days, 6 of them critical and 5 exploited in the wild. The most recent, CVE-2026-94057, was published on 19 September 2026. Nothing in the last four weeks, down from 4 vulnerabilities in the four before. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 4
- All time: 19 (6 critical, 5 exploited in the wild)

## About Exim

Open-source message transfer agent (MTA) for routing and delivering email messages.

## Latest Exim vulnerabilities

- [CVE-2026-94057: Exim SMTP smuggling in DATA phase rejection handling](https://junglewise.ai/threats/cve-2026-94057-exim-before-4-100-1-allows-smtp-smuggling-in-which-the-received) (medium, CVSS 4, published 19 Sep 2026)
- [CVE-2026-94056: Exim Proxy Protocol stack memory disclosure](https://junglewise.ai/threats/cve-2026-94056-exim-before-4-100-1-when-proxy-protocol-is-used-with-an-attacker) (high, CVSS 7.5, published 19 Sep 2026)
- [CVE-2026-94055: Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.](https://junglewise.ai/threats/cve-2026-94055-exim-before-4-100-1-when-certain-non-default-tls-settings-are) (low, CVSS 3.7, published 19 Sep 2026)
- [CVE-2026-94054: Exim out-of-bounds write in Proxy Protocol v1](https://junglewise.ai/threats/cve-2026-94054-exim-before-4-100-1-when-proxy-protocol-is-used-with-an-attacker) (high, CVSS 7, published 19 Sep 2026)
- [CVE-2026-66141: Exim privilege escalation in .forward pipe transport force_command](https://junglewise.ai/threats/cve-2026-66141-exim-privilege-escalation-in-forward-pipe-transport-force-command) (high, CVSS 7.4, published 24 Jul 2026)
- [CVE-2026-66140: Exim directory traversal in queue-name arguments](https://junglewise.ai/threats/cve-2026-66140-exim-directory-traversal-in-queue-name-arguments) (high, CVSS 8.4, published 24 Jul 2026)
- [CVE-2026-48840: Exim stack memory disclosure in PROXY protocol handling](https://junglewise.ai/threats/cve-2026-48840-exim-stack-memory-disclosure-in-proxy-protocol-handling) (medium, CVSS 5.3, published 30 May 2026)
- [CVE-2026-45185: Exim use-after-free in BDAT body parsing with GnuTLS](https://junglewise.ai/threats/cve-2026-45185-exim-use-after-free-in-bdat-body-parsing-with-gnutls) (critical, CVSS 9.8, published 12 May 2026)
- [CVE-2026-40687: In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an…](https://junglewise.ai/threats/cve-2026-40687-in-exim-before-4-99-2-when-the-spa-authentication-driver-is-used) (medium, CVSS 4.8, published 30 Apr 2026)
- [CVE-2026-40686: In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing…](https://junglewise.ai/threats/cve-2026-40686-in-exim-before-4-99-2-when-utf8-operators-are-enabled-there-is-an) (low, CVSS 3.7, published 30 Apr 2026)
- [CVE-2026-40685: In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator…](https://junglewise.ai/threats/cve-2026-40685-in-exim-before-4-99-2-when-json-lookup-is-enabled-an-out-of) (medium, CVSS 6.5, published 30 Apr 2026)
- [CVE-2026-40684: In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when…](https://junglewise.ai/threats/cve-2026-40684-in-exim-before-4-99-2-on-systems-using-musl-libc-not-glibc-an) (medium, CVSS 5.9, published 30 Apr 2026)
- [CVE-2025-67896: Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow…](https://junglewise.ai/threats/cve-2025-67896-exim-before-4-99-1-with-certain-non-default-rate-limit) (high, CVSS 7, published 14 Dec 2025)
- [CVE-2010-4344: Exim Heap-Based Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2010-4344-exim-heap-based-buffer-overflow-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022)
- [CVE-2010-4345: Exim Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2010-4345-exim-privilege-escalation-vulnerability) (critical, exploited in the wild, CVSS 7.8, published 25 Mar 2022)
- [CVE-2019-16928: Exim Out-of-bounds Write Vulnerability](https://junglewise.ai/threats/cve-2019-16928-exim-out-of-bounds-write-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022)
- [CVE-2019-10149: Exim Mail Transfer Agent (MTA) Improper Input Validation](https://junglewise.ai/threats/cve-2019-10149-exim-mail-transfer-agent-mta-improper-input-validation) (critical, exploited in the wild, CVSS 9.8, published 10 Jan 2022)
- [CVE-2018-6789: Exim Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2018-6789-exim-buffer-overflow-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 3 Nov 2021)
- [CVE-1999-0971: Exim buffer overflow in .forward file processing](https://junglewise.ai/threats/cve-1999-0971-exim-buffer-overflow-in-forward-file-processing) (high, CVSS 7.2, published 22 Jul 1997)

## Most severe Exim vulnerabilities

- [CVE-2010-4344: Exim Heap-Based Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2010-4344-exim-heap-based-buffer-overflow-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022)
- [CVE-2019-16928: Exim Out-of-bounds Write Vulnerability](https://junglewise.ai/threats/cve-2019-16928-exim-out-of-bounds-write-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022)
- [CVE-2019-10149: Exim Mail Transfer Agent (MTA) Improper Input Validation](https://junglewise.ai/threats/cve-2019-10149-exim-mail-transfer-agent-mta-improper-input-validation) (critical, exploited in the wild, CVSS 9.8, published 10 Jan 2022)
- [CVE-2018-6789: Exim Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2018-6789-exim-buffer-overflow-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 3 Nov 2021)
- [CVE-2010-4345: Exim Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2010-4345-exim-privilege-escalation-vulnerability) (critical, exploited in the wild, CVSS 7.8, published 25 Mar 2022)
- [CVE-2026-45185: Exim use-after-free in BDAT body parsing with GnuTLS](https://junglewise.ai/threats/cve-2026-45185-exim-use-after-free-in-bdat-body-parsing-with-gnutls) (critical, CVSS 9.8, published 12 May 2026)
- [CVE-2026-66140: Exim directory traversal in queue-name arguments](https://junglewise.ai/threats/cve-2026-66140-exim-directory-traversal-in-queue-name-arguments) (high, CVSS 8.4, published 24 Jul 2026)
- [CVE-2026-94056: Exim Proxy Protocol stack memory disclosure](https://junglewise.ai/threats/cve-2026-94056-exim-before-4-100-1-when-proxy-protocol-is-used-with-an-attacker) (high, CVSS 7.5, published 19 Sep 2026)
- [CVE-2026-66141: Exim privilege escalation in .forward pipe transport force_command](https://junglewise.ai/threats/cve-2026-66141-exim-privilege-escalation-in-forward-pipe-transport-force-command) (high, CVSS 7.4, published 24 Jul 2026)
- [CVE-1999-0971: Exim buffer overflow in .forward file processing](https://junglewise.ai/threats/cve-1999-0971-exim-buffer-overflow-in-forward-file-processing) (high, CVSS 7.2, published 22 Jul 1997)

## Vulnerabilities per week

Nothing in the last four weeks, down from 4 vulnerabilities in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 4 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Exim technologies

- [Exim](https://junglewise.ai/threats/technologies/exim): 19 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Exim vulnerabilities", https://junglewise.ai/threats/vendors/exim, 12 November 2026.