01 Record

CVE-2021-38500

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these

UnratedPUBLISHEDCNA: mozilla

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 Description

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these

03 Exploitation and scoring

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: 1.27% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 67.8% 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.

04 Metadata

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')Base

Data version

5.1

Document digest

e842078fe0e7377342db2ada554d284ac5e3bd3cd31edf366aaf0e4d16e436a5

05 Affected products

VendorProductVersionsPlatforms

MozillaThunderbird< 78.15, < 91.2—

MozillaFirefox ESR< 91.2, < 78.15—

MozillaFirefox< 93—

06 References

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/buglist.cgi?bug_id=1725854%2C1728321x_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

01 Record index

CVE-2021-38500

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-38500

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References