CVE-2021-44686

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

5.21% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 92.2% of scored records. A rank, not a probability.

NVD base score

7.5 (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:N/I:N/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

2021-12-06 23:41Z4 YR AGO

Last updated

2025-11-04 16:09Z11 MO AGO

Reserved

2021-12-06

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.2

Document digest

46b80d053259eb18dbd92307a46c0ff75879bb069538a09a650c0598d39b6904

• bugs.launchpad.nethttps://bugs.launchpad.net/calibre/+bug/1951979x_refsource_MISC
• github.comhttps://github.com/dwisiswant0/advisory/issues/18x_refsource_MISC
• github.comhttps://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-e42fadbcc3https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/vendor-advisoryx_refsource_FEDORA
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/09/msg00005.html