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🛡️ USN-8382-1 — exim4 (CVE-2023-51766 +5 more)

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

exim4 vulnerabilities

Timo Longin discovered that Exim incorrectly handled certain SMTP messages

in PIPELINING/CHUNKING configurations. A remote attacker could possibly use

this issue to perform SMTP smuggling. This issue only affected Ubuntu

14.04 LTS. (CVE-2023-51766)

It was discovered that Exim incorrectly handled certain malformed JSON

data in headers. A remote attacker could possibly use this issue to crash

Exim, resulting in a denial of service, or execute arbitrary code. This

issue only affected Ubuntu 20.04 LTS. (CVE-2026-40685)

It was discovered that Exim incorrectly handled certain malformed UTF-8

headers. A remote attacker could possibly use this issue to obtain

sensitive information. This issue only affected Ubuntu 20.04 LTS.

(CVE-2026-40686)

It was discovered that Exim incorrectly handled certain SPA resources.

A remote attacker could possibly use this issue to crash Exim, resulting in

a denial of service, or obtain sensitive information. This issue only

affected Ubuntu 20.04 LTS. (CVE-2026-40687)

It was discovered that Exim incorrectly handled certain CHUNKING

transfers in some GnuTLS configurations. A remote attacker could possibly

use this issue to crash Exim, resulting in a denial of service, or execute

arbitrary code. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-45185)

Warisjeet Singh discovered that Exim incorrectly handled certain proxy

connections in builds with proxy support enabled. A remote attacker could

possibly use this issue to obtain sensitive information. This issue only

affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

(CVE-2026-48840)

Affected software

USN-8382-1 is recorded against 1 package.

  • exim4 (fixed in 4.93-13ubuntu1.12+esm1)

Timeline and source

Published on 3 June 2026 and last revised on 4 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Advisory)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)

Other advisories for this package

exim4 has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-03
Updated 2026-08-20
Modified 2026-06-04
Fix URL N/A

Affected Packages

Software From version Fixed in
exim4 — 4.93-13ubuntu1.12+esm1

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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