CVE-2020-23856 Use after free in n/a

What is CVE-2020-23856?

CVE-2020-23856 is a medium-severity use after free vulnerability in Fedoraproject Fedora, published on 18 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Use-after-Free vulnerability in cflow 1.6 in the void call(char *name, int line) function at src/parser.c, which could cause a denial of service via the pointer variable caller->callee.

Weakness: CWE-416

Which versions are affected by CVE-2020-23856?

It affects 2 products.

Products include Fedoraproject Fedora, Gnu Cflow.

How do I fix CVE-2020-23856?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2020-23856 being exploited?

There is no known exploitation of CVE-2020-23856 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-2020-23856, GHSA-h5qf-rf3c-vmj5, UBUNTU-CVE-2020-23856.