CVE-2020-12783

Published: May 11, 2020Modified: Jun 17, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.

Affected (11)

Products: Exim: Exim · Fedoraproject: Fedora · Debian: Debian Linux · +1 more

Show all products

Exim: Exim · Fedoraproject: Fedora · Debian: Debian Linux · Canonical: Ubuntu Linux

1 product

1 product

1 product

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Exim Exim	Up to 4.93

Configuration B

2 vulnerable

Vulnerable Software	Affected Versions
Fedoraproject Fedora	Version 31
Fedoraproject Fedora	Version 32

Configuration C

3 vulnerable

Vulnerable Software	Affected Versions
Debian Debian Linux	Version 10.0
Debian Debian Linux	Version 8.0
Debian Debian Linux	Version 9.0

Configuration D

5 vulnerable

Vulnerable Software	Affected Versions
Canonical Ubuntu Linux	Version 14.04
Canonical Ubuntu Linux	Version 16.04
Canonical Ubuntu Linux	Version 18.04
Canonical Ubuntu Linux	Version 19.10
Canonical Ubuntu Linux	Version 20.04

Related CWEs

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

References (18)

http://www.openwall.com/lists/oss-security/2021/05/04/7

Source: cve@mitre.org

ExploitMailing ListThird Party Advisory

https://bugs.exim.org/show_bug.cgi?id=2571

Source: cve@mitre.org

Third Party Advisory

https://git.exim.org/exim.git/commit/57aa14b216432be381b6295c312065b2fd034f86

Source: cve@mitre.org

PatchThird Party Advisory

https://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0

Source: cve@mitre.org

PatchThird Party Advisory

https://lists.debian.org/debian-lts-announce/2020/05/msg00017.html

Source: cve@mitre.org

Mailing ListThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F6IQQ2SERFUD4WMRSX6XYDNK7Q4GPT7Y/

Source: cve@mitre.org

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7Z5UG6ZIG32V7M4PP3BCC65C27EWK7G/

Source: cve@mitre.org

https://usn.ubuntu.com/4366-1/

Source: cve@mitre.org

Third Party Advisory

https://www.debian.org/security/2020/dsa-4687

Source: cve@mitre.org

Third Party Advisory

http://www.openwall.com/lists/oss-security/2021/05/04/7

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitMailing ListThird Party Advisory

https://bugs.exim.org/show_bug.cgi?id=2571

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://git.exim.org/exim.git/commit/57aa14b216432be381b6295c312065b2fd034f86

Source: af854a3a-2127-422b-91ae-364da2661108

PatchThird Party Advisory

https://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0

Source: af854a3a-2127-422b-91ae-364da2661108

PatchThird Party Advisory

https://lists.debian.org/debian-lts-announce/2020/05/msg00017.html

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing ListThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F6IQQ2SERFUD4WMRSX6XYDNK7Q4GPT7Y/

Source: af854a3a-2127-422b-91ae-364da2661108

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7Z5UG6ZIG32V7M4PP3BCC65C27EWK7G/

Source: af854a3a-2127-422b-91ae-364da2661108

https://usn.ubuntu.com/4366-1/

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.debian.org/security/2020/dsa-4687

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

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