Is CVE-2020-27840 in the CISA KEV catalog?

No. CVE-2020-27840 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27840?

CVE-2020-27840 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-27840?

CVE-2020-27840 has an EPSS score of 3.83% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27840?

Upgrade ldb on debian 11 to 2:2.2.0-3.1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27840

HIGHEPSS 89th pctl

7.5

CVSS v3

NVD

Description

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.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

ldbDebian

Fixed in:2:2.2.0-3.1CVE-2020-27840

ldbUbuntu

Fixed in:1:1.1.24-0ubuntu0.14.04.2+esm1USN-4888-2

Fixed in:2:1.1.24-1ubuntu3.2USN-4888-1

Fixed in:2:1.2.3-1ubuntu0.2USN-4888-1

Fixed in:2:2.0.10-0ubuntu0.20.04.3USN-4888-1

libldb1Ubuntu

Fixed in:1:1.1.24-0ubuntu0.14.04.2+esm1USN-4888-2

Fixed in:2:1.1.24-1ubuntu3.2USN-4888-1

Fixed in:2:1.2.3-1ubuntu0.2USN-4888-1

libldb2Ubuntu

Fixed in:2:2.0.10-0ubuntu0.20.04.3USN-4888-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.83%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Vendor Advisory1

samba.org

Third-Party Advisory5

Other references3

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.