CVE-2021-3939

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.35% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 27.7% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-11-17 03:15Z4 YR AGO

Last updated

2024-09-16 18:02Z1 YR AGO

Reserved

2021-11-09

Assigning CNA

canonical

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

• CWE-590Free of Memory not on the HeapVariant
• CWE-763Release of Invalid Pointer or ReferenceBase

Data version

5.1

Document digest

3b0481125ebc341ed241c7c298e7bb341f600d0a84cc4fad7cc6d50bea4d3aff

• ubuntu.comhttps://ubuntu.com/security/notices/USN-5149-1
• bugs.launchpad.nethttps://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149
• packetstormsecurity.comhttp://packetstormsecurity.com/files/172848/Ubuntu-accountsservice-Double-Free-Memory-Corruption.html