CVE-2020-28024 — Out-of-bounds Write in Exim

CWE-787 — Out-of-bounds WriteCWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer8 documents7 sources
Severity
9.8CRITICALNVD
EPSS
4.4%
top 11.03%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Exim
Timeline
PublishedMay 6
Latest updateMay 24

Description

Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages1 packages

▶NVDexim/exim4.00 — 4.94.2

🔴Vulnerability Details

3
GHSA
GHSA-4wmr-6rg6-hfcg: Exim 4 before 4↗2022-05-24
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OSV
CVE-2020-28024: Exim 4 before 4↗2021-05-06
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CVEList
CVE-2020-28024: Exim 4 before 4↗2021-05-06
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📋Vendor Advisories

3
Ubuntu
Exim vulnerabilities↗2021-05-06
▶
Ubuntu
Exim vulnerabilities↗2021-05-04
▶
Debian
CVE-2020-28024: exim4 - Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated...↗2020
▶

🕵️Threat Intelligence

1
Qualys
21Nails: Multiple Critical Vulnerabilities in Exim Mail Server↗2021-05-04
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