CVE-2021-27836 Null dereference in n/a

What is CVE-2021-27836?

CVE-2021-27836 is a medium-severity vulnerability in Fedoraproject Fedora, published on 3 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2021-27836?

1 open source package ship an affected version, including readxl. It affects 2 products.

Products include Fedoraproject Fedora, Libxls Project Libxls.

How do I fix CVE-2021-27836?

Upgrade readxl to 1.4.2 or later.

Is CVE-2021-27836 being exploited?

There is no known exploitation of CVE-2021-27836 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-27836, GHSA-gvjp-hxqq-9fc2, RSEC-2023-2, UBUNTU-CVE-2021-27836, openSUSE-SU-2022:0142-1, openSUSE-SU-2024:12084-1.