Is CVE-2021-3939 in the CISA KEV catalog?

No. CVE-2021-3939 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3939?

CVE-2021-3939 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-3939?

CVE-2021-3939 has an EPSS score of 0.35% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3939?

Upgrade accountsservice on ubuntu 20.04 to 0.6.55-0ubuntu12~20.04.5 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3939

HIGH

7.8

CVSS v3

NVD

Description

Ubuntu-specific modifications to accountsservice (in patch file debian/patches/0010-set-language.patch) caused the fallback_locale variable, pointing to static storage, to be freed, in the user_change_language_authorized_cb function. This is reachable via the SetLanguage dbus function. This is fixed in versions 0.6.55-0ubuntu12~20.04.5, 0.6.55-0ubuntu13.3, 0.6.55-0ubuntu14.1.

CWE-590 CWE-763

How to fix

Remediation Available

accountsserviceUbuntu

Fixed in:0.6.55-0ubuntu12~20.04.5USN-5149-1

libaccountsservice0Ubuntu

Fixed in:0.6.55-0ubuntu12~20.04.5USN-5149-1

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.35%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Vendor Advisory1

ubuntu.com

Other references2

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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.