CVE-2018-25021

Name: CVE-2018-25021
Creator: NVD / NIST
Published: 2021-12-13T01:15:07.533+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.27%

Last modified Jun 17, 2026

CVE-2018-25021 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The TCP Server module in toxcore before 0.2.8 doesn't free the TCP priority queue under certain conditions, which allows a remote attacker to exhaust the system's memory, causing a denial of service (DoS).. EPSS estimates a 2.27% chance of exploitation in the next 30 days.

Description

The TCP Server module in toxcore before 0.2.8 doesn't free the TCP priority queue under certain conditions, which allows a remote attacker to exhaust the system's memory, causing a denial of service (DoS).

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.27%

80.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-404

Affected Software

Vendor	Product	Versions
Toktok	Toxcore	< 0.2.8

References

https://blog.tox.chat/2018/10/memory-leak-bug-and-new-toxcore-release-fixing-it/Third Party Advisory
https://github.com/TokTok/c-toxcore/issues/1214Exploit, Third Party Advisory
https://github.com/TokTok/c-toxcore/pull/1216Third Party Advisory
https://blog.tox.chat/2018/10/memory-leak-bug-and-new-toxcore-release-fixing-it/Third Party Advisory
https://github.com/TokTok/c-toxcore/issues/1214Exploit, Third Party Advisory
https://github.com/TokTok/c-toxcore/pull/1216Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2018-25021?

How severe is CVE-2018-25021?

CVE-2018-25021 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.27% probability of exploitation in the next 30 days.

How do I fix CVE-2018-25021?

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-2018-25021?

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

Scan your code now

Source: NVD / NIST