CVE-2018-25021
The TCP Server module in toxcore before 0.2.8 doesn't free the TCP priority queue under certain...
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).
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
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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).
- Record
CVE-2018-25021- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-404
- Updated
- 2026-11-02
CVE List No score
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).
- Record
CVE-2018-25021- Updated
- 2026-11-02
EUVDEUVD-2018-13802 No score
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).
- Record
EUVD-2018-13802- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-p3p2-9rqf-r8j8 No score
The TCP Server module in toxcore before 0.2.8 doesn't free the TCP priority queue under certain...
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).
- Record
GHSA-p3p2-9rqf-r8j8- Weakness
- CWE-404
- Updated
- 2026-11-02
OSV
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).
- Record
CVE-2018-25021- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-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).
- Record
DEBIAN-CVE-2018-25021- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-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).
- Record
UBUNTU-CVE-2018-25021- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libtoxcoreDebian:12 |
before 0.2.8-1 | 0.2.8-1 |
libtoxcoreDebian:13 |
before 0.2.8-1 | 0.2.8-1 |
libtoxcoreDebian:14 |
before 0.2.8-1 | 0.2.8-1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-25021 is a high vulnerability (CVSS 7.5) 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 2.34%, the 83rd percentile. Fixed in libtoxcore 0.2.8-1.
References
github.com/TokTok/c-toxcore/issues/1214
blog.tox.chat/2018/10/memory-leak-bug-and-new-toxcore-release-fixing-it
nvd.nist.gov/vuln/detail/CVE-2018-25021
security-tracker.debian.org/tracker/CVE-2018-25021
ubuntu.com/security/CVE-2018-25021
cve.org/CVERecord?id=CVE-2018-25021