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CVE-2021-44847

A stack-based buffer overflow in handle_request function in DHT.c in toxcore 0.1.9 through 0.1.11...

9.8 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

4.13%Up 3.2 points since Dec 13, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

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.

Record
CVE-2021-44847
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-682
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2021-44847
Updated
2026-11-02
EUVDEUVD-2021-31650 No score

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.

Record
EUVD-2021-31650
Updated
2026-11-03
GitHub AdvisoriesGHSA-62pr-4hg6-fwph 9.8

A stack-based buffer overflow in handle_request function in DHT.c in toxcore 0.1.9 through 0.1.11...

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.

Record
GHSA-62pr-4hg6-fwph
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSV 9.8

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.

Record
CVE-2021-44847
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-44847 9.8

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.

Record
DEBIAN-CVE-2021-44847
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 4 moreShow less
OSVUBUNTU-CVE-2021-44847 9.8

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.

Record
UBUNTU-CVE-2021-44847
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVMGASA-2021-0596 No score

Updated toxcore packages fix security vulnerability

stack-based buffer overflow in handle_request() in DHT.c (CVE-2021-44847)

Record
MGASA-2021-0596
Updated
2026-11-02
OSVopenSUSE-SU-2021:1640-1 No score

Security update for c-toxcore

c-toxcore was updated fo fix a securiy issue:

  • CVE-2021-44847: Fixed a buffer overflow in handle_request in DHT.c which could lead to remote DoS and potential code execution (boo#1193667)
Record
openSUSE-SU-2021:1640-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11846-1 No score

qtox-1.17.4-1.1 on GA media

These are all security issues fixed in the qtox-1.17.4-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11846-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libtoxcore
Debian:12
 before 0.2.13-1
0.2.13-1
libtoxcore
Debian:13
 before 0.2.13-1
0.2.13-1
libtoxcore
Debian:14
 before 0.2.13-1
0.2.13-1
toxcore
Mageia:8
 before 0.2.12-1.1.mga8
0.2.12-1.1.mga8
libtoxcore
Ubuntu:20.04:LTS
 All versions, plus listed versions
0.2.10-1build2
 None known
libtoxcore
Ubuntu:22.04:LTS
 before 0.2.13-1, plus listed versions
0.2.12-10.2.12-1build1
0.2.13-1
c-toxcore
SUSE:Package Hub 15 SP1
 before 0.2.13-bp153.2.3.1
0.2.13-bp153.2.3.1
c-toxcore
SUSE:Package Hub 15 SP2
 before 0.2.13-bp153.2.3.1
0.2.13-bp153.2.3.1
c-toxcore
SUSE:Package Hub 15 SP3
 before 0.2.13-bp153.2.3.1
0.2.13-bp153.2.3.1
c-toxcore
openSUSE:Leap 15.2
 before 0.2.13-bp153.2.3.1
0.2.13-bp153.2.3.1
c-toxcore
openSUSE:Leap 15.3
 before 0.2.13-bp153.2.3.1
0.2.13-bp153.2.3.1
qtox
openSUSE:Tumbleweed
 before 1.17.4-1.1
1.17.4-1.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-44847 is a critical vulnerability (CVSS 9.8) in Toktok Toxcore, published December 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.13%, the 90th percentile. Fixed in libtoxcore 0.2.13-1.

References

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