CVE-2020-12783

moderate-risk

Published 2020-05-11

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.

Do I need to act?

3.2% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (11)

Exim

Fedora

Debian Linux

Ubuntu Linux

Affected Vendors

Debian Canonical Fedoraproject Exim

References (18)

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

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

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

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

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

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

Third Party Advisory https://usn.ubuntu.com/4366-1/

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

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

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

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

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

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

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

Third Party Advisory https://usn.ubuntu.com/4366-1/

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

/ 100

moderate-risk

Severity 26/34 · High

Exploitability 6/34 · Minimal

Exposure 16/34 · Moderate