CVE-2021-44847

Name: CVE-2021-44847
Creator: NVD / NIST
Published: 2021-12-13T01:15:07.73+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.95%

Last modified Jun 17, 2026

CVE-2021-44847 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A stack-based buffer overflow in handle_request function in DHT.c in toxcore 0.1.9 through 0.1.11 and 0.2.0 through 0.2.12 (caused by an improper length calculation during the handling of received network packets) allows remote attackers to crash the process or potentially execute arbitrary code via a network packet.. EPSS estimates a 3.95% chance of exploitation in the next 30 days.

Description

A stack-based buffer overflow in handle_request function in DHT.c in toxcore 0.1.9 through 0.1.11 and 0.2.0 through 0.2.12 (caused by an improper length calculation during the handling of received network packets) allows remote attackers to crash the process or potentially execute arbitrary code via a network packet.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.95%

89.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-682

Affected Software

Vendor	Product	Versions
Toktok	Toxcore	>= 0.1.9, <= 0.1.11
Toktok	Toxcore	>= 0.2.0, <= 0.2.12
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35

References

https://github.com/TokTok/c-toxcore/pull/1718Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S7EBS3NIRYJ7V3PTNINP3PJSVUHGZTGA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLTKINSPO5T65LB3ZASDPCREKUE22RYE/
https://github.com/TokTok/c-toxcore/pull/1718Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S7EBS3NIRYJ7V3PTNINP3PJSVUHGZTGA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLTKINSPO5T65LB3ZASDPCREKUE22RYE/

Timeline

Published: Dec 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44847?

How severe is CVE-2021-44847?

CVE-2021-44847 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44847?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-44847?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST