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No exploitation reportedFix available

CVE-2021-27836

No exploitation reported by the sources we read.

  • Published2021-11-03
  • WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

Timeline

dates in UTC
  1. 2021-11-0317:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
33.x= 33no fix published
34.x= 34no fix published
35.x= 35no fix published
Libxls project libxls
BranchAffectedFixed in
1.6= 1.6.2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libxlsSUSE:Package Hub 15 SP3all versions · fixed in 1.6.2-bp153.2.6.1
  • libxlsopenSUSE:Leap 15.3all versions · fixed in 1.6.2-bp153.2.6.1
  • r-cran-readxlUbuntu:26.10all versions · no fixed version listed
  • r-cran-readxlUbuntu:26.04:LTSall versions · no fixed version listed
  • r-cran-readxlUbuntu:25.10all versions · no fixed version listed
  • r-cran-readxlUbuntu:24.04:LTSall versions · no fixed version listed
  • r-cran-readxlUbuntu:22.04:LTSall versions · no fixed version listed
  • r-cran-readxlUbuntu:20.04:LTSall versions · no fixed version listed

5 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published
2021-11-03
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-gvjp-hxqq-9fc2

Frequently asked questions

What is CVE-2021-27836?

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

Is CVE-2021-27836 actively exploited?

Active exploitation of CVE-2021-27836 has not been confirmed. Its EPSS score was 1.2% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27836?

CVE-2021-27836 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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Sources for this record