How severe is CVE-2023-6180?

CVE-2023-6180 has a CVSS 3.x base score of 5.3, rated medium 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 low.

Is CVE-2023-6180 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-6180?

CVE-2023-6180 affects Cloudflare Boring. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-6180?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-6180 published?

CVE-2023-6180 was published on 2023-12-05 and last updated on 2026-06-17.

CVE-2023-6180

CVE-2023-6180 is a medium-severity vulnerability in Cloudflare Boring with a CVSS 3.x base score of 5.3. 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-401.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-401
Affected product: Cloudflare Boring
Published: 2023-12-05
Last modified: 2026-06-17

Description

The tokio-boring library in version 4.0.0 is affected by a memory leak issue that can lead to excessive resource consumption and potential DoS by resource exhaustion. The set_ex_data function used by the library did not deallocate memory used by pre-existing data in memory each time after completing a TLS connection causing the program to consume more resources with each new connection.

Frequently asked questions

What is CVE-2023-6180?: The tokio-boring library in version 4.0.0 is affected by a memory leak issue that can lead to excessive resource consumption and potential DoS by resource exhaustion. The set_ex_data function used by the library did not deallocate memory used by pre-existing data in memory each time after completing a TLS connection causing the program to consume more resources with each new connection.
How severe is CVE-2023-6180?: CVE-2023-6180 has a CVSS 3.x base score of 5.3, rated medium 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 low.
Is CVE-2023-6180 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-6180?: CVE-2023-6180 affects Cloudflare Boring. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-6180?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-6180 published?: CVE-2023-6180 was published on 2023-12-05 and last updated on 2026-06-17.

References

https://github.com/cloudflare/boring/security/advisories/GHSA-pjrj-h4fg-6gm4

Affected products (1)

cpe:2.3:a:cloudflare:boring:4.0.0:*:*:*:*:rust:*:*

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