Security readout for executives and security teams
Plain-English summary
CVE-2018-25021 is a remote denial-of-service issue in toxcore. A memory leak in the TCP Server module can let an attacker exhaust system memory, potentially making a Tox service or host unstable or unavailable. The provided sources do not indicate data theft, privilege escalation, or active exploitation.
Executive priority
Treat this as a moderate availability risk. Prioritize remediation where toxcore TCP services are internet-facing, business-critical, or running on shared infrastructure. Lower priority is reasonable where toxcore is absent, updated, or not remotely reachable.
Technical view
toxcore versions before 0.2.8 do not free the TCP priority queue under certain conditions in the TCP Server module. The issue can be triggered remotely and leads to memory exhaustion. Public references include a GitHub issue, a fixing pull request, and a Tox blog post announcing the fixed release.
Likely exposure
Exposure is likely limited to systems running toxcore before 0.2.8 with the TCP Server module enabled or reachable. The CVE record does not provide CPEs, downstream product mapping, or deployment prevalence, so inventory confirmation is required.
Exploitation context
The source bundle supports remote denial of service through memory exhaustion. It does not show active exploitation, public weaponization, KEV listing, or broader impact beyond availability.
Researcher notes
The CVE metadata lacks CVSS, CWE, CPEs, and structured affected-product detail. The strongest evidence is the upstream issue, fixing pull request, and release blog. Avoid assuming impact in downstream products without confirming their bundled toxcore version.
Mitigation direction
- Upgrade toxcore to version 0.2.8 or later.
- Review the Tox release announcement and vendor guidance.
- Restrict network exposure to toxcore TCP services where possible.
- Monitor memory usage on exposed toxcore hosts.
- Identify downstream applications bundling vulnerable toxcore versions.
Validation and detection
- Inventory systems and applications using toxcore.
- Confirm installed toxcore versions are 0.2.8 or later.
- Check whether the TCP Server module is enabled or exposed.
- Review logs and telemetry for unexplained memory growth.
- Confirm operational monitoring alerts on memory exhaustion.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-25021 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/TokTok/c-toxcore/issues/1214CVE reference · x_refsource_MISC
- https://github.com/TokTok/c-toxcore/pull/1216CVE reference · x_refsource_MISC
- https://blog.tox.chat/2018/10/memory-leak-bug-and-new-toxcore-release-fixing-it/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.