CVE-2020-27840

high-risk

Published 2021-05-12

A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.

Do I need to act?

14.5% chance of exploitation in next 30 days

EPSS score — higher than 85% of all CVEs

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 (6)

Samba

Debian Linux

Fedora

Affected Vendors

Debian Samba Fedoraproject

References (18)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1941400

Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html

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

Third Party Advisory https://security.gentoo.org/glsa/202105-22

Third Party Advisory https://security.netapp.com/advisory/ntap-20210326-0007/

Third Party Advisory https://www.debian.org/security/2021/dsa-4884

Vendor Advisory https://www.samba.org/samba/security/CVE-2020-27840.html

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1941400

Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html

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

Third Party Advisory https://security.gentoo.org/glsa/202105-22

Third Party Advisory https://security.netapp.com/advisory/ntap-20210326-0007/

Third Party Advisory https://www.debian.org/security/2021/dsa-4884

Vendor Advisory https://www.samba.org/samba/security/CVE-2020-27840.html

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high-risk

Severity 26/34 · High

Exploitability 12/34 · Low

Exposure 13/34 · Low