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Fencer Vulns
medium 6.5

CVE-2021-27836 json

Denial of Service (DoS) vulnerability

published 2021-11-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14575 , RSEC-2023-2

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

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.

Patch / fix

  • cran readxl 1.4.2
  • libxls Package Hub 15 SP3, openSUSE Leap 15.3 1.6.2-bp153.2.6.1

opensuse advisories openSUSE-SU-2022:0142-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-27836 updated cvss 6.5

libxls: a denial of service via a crafted XLS file

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected packages

ecosystem package affected fixed in
cran readxl
>=1.4.1, <1.4.2
1.4.2

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.