How severe is CVE-2018-25021?

CVE-2018-25021 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-25021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-25021?

CVE-2018-25021 affects Toktok Toxcore. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-25021?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-25021 published?

CVE-2018-25021 was published on 2021-12-13 and last updated on 2026-06-17.

CVE-2018-25021

CVE-2018-25021 is a high-severity vulnerability in Toktok Toxcore with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-404.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-404
Affected product: Toktok Toxcore
Published: 2021-12-13
Last modified: 2026-06-17

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).

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).
How severe is CVE-2018-25021?: CVE-2018-25021 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-25021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-25021?: CVE-2018-25021 affects Toktok Toxcore. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-25021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-25021 published?: CVE-2018-25021 was published on 2021-12-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:toktok:toxcore:*:*:*:*:*:*:*:*

More vulnerabilities in Toktok Toxcore

CVE-2021-44847 — Critical (CVSS 9.8): A stack-based buffer overflow in handle_request function in DHT.c in toxcore 0.1.9 through 0.1.11 and 0.2.0 through…
CVE-2018-25022 — Low (CVSS 3.1): The Onion module in toxcore before 0.2.2 doesn't restrict which packets can be onion-routed, which allows a remote…

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