What’s Vulnerable › Vulnerabilities

CVE-2018-25021

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-13 · updated 2026-06-17
• Weakness: CWE-404

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).

Affected products

• Toktok Toxcore: before 0.2.8 — fixed in 0.2.8

How to fix

Upgrade to a fixed version: Toktok Toxcore 0.2.8. Check the vendor advisory for mitigations.

References

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

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