CVE-2021-44538

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

2.00% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 80.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI: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

2021-12-14 13:26Z4 YR AGO

Last updated

2024-08-04 04:25Z2 YR AGO

Reserved

2021-12-03

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.1

Document digest

fd17fe3d207eb63a8352aca0c217b6829b5e9fe4128ec9d36cc82f9c3216e136

• gitlab.matrix.orghttps://gitlab.matrix.org/matrix-org/olm/-/tagsx_refsource_MISC
• matrix.orghttps://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdkx_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