CVE-2020-6820

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2021-11-03. Federal remediation due 2022-05-03.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

7.06% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 93.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Critical. Red Hat's rating for its own products, not a CVSS rating.

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

2020-04-24 15:56Z6 YR AGO

Last updated

2025-10-21 23:35Z10 MO AGO

Reserved

2020-01-10

Assigning CNA

mozilla

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

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

Weaknesses

• CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class
• CWE-416Use After FreeVariant

Data version

5.1

Document digest

c5eca3b1284072c895732b39efc755ab48a8b83b73a92d2cf66f21c9ef27becd

• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2020-14/x_refsource_MISC
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2020-11/x_refsource_MISC
• bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1626728x_refsource_MISC
• usn.ubuntu.comUSN-4335-1https://usn.ubuntu.com/4335-1/vendor-advisoryx_refsource_UBUNTU
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820government-resource