PT-2021-7698 · Exim+4 · Exim+4

Damian Poddebniak + 3 · CVE-2021-38371 · Published 2021-08-10 · Updated 2024-10-29

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:C/A:N

Name of the Vulnerable Software and Affected Versions Exim versions through 4.94.2

Description The issue is related to the STARTTLS feature in Exim, which allows response injection during MTA SMTP sending. This is due to insufficient neutralization of special elements in the request. The exploitation of this issue may allow a remote attacker to impact data integrity.

Recommendations For Exim versions through 4.94.2, update to a version that contains a fix for this issue to prevent response injection during MTA SMTP sending. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Special Elements Injection

Weakness Enumeration

CWE-74

Related Identifiers

ALT-PU-2023-4105

ALT-PU-2023-4919

ALT-PU-2023-4920

ALT-PU-2023-5120

BDU:2023-01672

CVE-2021-38371

DLA-3938-1

USN-6881-1

Affected Products

Alt Linux

Astra Linux

Exim

Linuxmint

Ubuntu

References · 23

• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2024-0416SE47 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-38371 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-6881-1 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3938-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2023-1023SE17 · Vendor Advisory
• https://osv.dev/vulnerability/USN-6881-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-38371 · Security Note
• https://wiki.astralinux.ru/astra-linux-se81-bulletin-20241206SE81 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2023-0303SE17MD · Vendor Advisory
• https://exim.org/static/doc/security/CVE-2021-38371.txt · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-01672 · Security Note
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20231214SE16 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-38371 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-38371 · Security Note
• https://ubuntu.com/security/CVE-2021-38371 · Vendor Advisory