Is CVE-2020-27840 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 4%.

What products does CVE-2020-27840 affect?

Tracked products affected include Samba. Check the version you run to see whether it is affected.

How do I fix CVE-2020-27840?

Apply the vendor fix promptly. Upgrade affected products to a fixed version.

CVE-2020-27840

Q: What is CVE-2020-27840?

CVE-2020-27840 is a high-severity software vulnerability (Out-of-bounds read) with a CVSS score of 7.5. 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 t

HIGH severity · CVSS 7.5 · Out-of-bounds read

7.5CVSS HIGH

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)4%

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

Affected products we track (1)

Samba

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

NVD record
https://bugzilla.redhat.com/show_bug.cgi?id=1941400Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00036.htmlAdvisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
https://security.gentoo.org/glsa/202105-22Advisory
https://security.netapp.com/advisory/ntap-20210326-0007/Advisory
https://www.debian.org/security/2021/dsa-4884Advisory