CVE-2021-38496

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

1.65% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 76.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Important. 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

2021-11-03 00:03Z4 YR AGO

Last updated

2024-08-04 01:44Z2 YR AGO

Reserved

2021-08-10

Assigning CNA

mozilla

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.1

Document digest

e3eb3a411a6df1fa833e67fdcd13b22978c769199d0a8e2fc00a40badaf7609a

• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2021-47/x_refsource_MISC
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2021-45/x_refsource_MISC
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2021-43/x_refsource_MISC
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2021-46/x_refsource_MISC
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2021-44/x_refsource_MISC
• bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1725335x_refsource_MISC
• www.debian.orgDSA-5034https://www.debian.org/security/2022/dsa-5034vendor-advisoryx_refsource_DEBIAN
• lists.debian.org[debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security updatehttps://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlmailing-listx_refsource_MLIST