CVE-2021-27836

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

1.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 64.8% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-11-03 16:07Z4 YR AGO

Last updated

2024-08-03 21:33Z2 YR AGO

Reserved

2021-03-01

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-476NULL Pointer DereferenceBase

Data version

5.1

Document digest

1b25ebcfad6c97ce675645811c180fc20af4c5dba0f716523c3101adc0572dc2

• github.comhttps://github.com/libxls/libxls/issues/94x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-785cdbddf9https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SFOE4Z6T46LA47VXWUVET4ELXRZQ3BWB/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-033a5fe9e5https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y6XOTFEOCHYKZAFCB6H3KNIIFJ3UFV7V/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-25e89d9374https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5D7XXCVFYRRMI4ENXYSD3MZEBS6SMI7E/vendor-advisoryx_refsource_FEDORA