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No exploitation reportedFix available

CVE-2018-25021

No exploitation reported by the sources we read.

  • Published2021-12-13
  • Fixed in0.2.8
  • WeaknessCWE-404

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC
  1. 2021-12-1301:15CVE publishedNVD

Versions per branch

NVD
Toktok toxcore
BranchAffectedFixed in
0.2< 0.2.80.2.8

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libtoxcoreDebian:14all versions · fixed in 0.2.8-1
  • libtoxcoreDebian:13all versions · fixed in 0.2.8-1
  • libtoxcoreDebian:12all versions · fixed in 0.2.8-1

Full record on NVD

Fix

  1. Update Toktok toxcore to 0.2.8

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-12-13
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-p3p2-9rqf-r8j8

Frequently asked questions

What is CVE-2018-25021?

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).

Is CVE-2018-25021 actively exploited?

Active exploitation of CVE-2018-25021 has not been confirmed. Its EPSS score was 2.3% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-25021?

CVE-2018-25021 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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