How severe is CVE-2023-33980?

CVE-2023-33980 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-2023-33980 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-33980?

CVE-2023-33980 affects Briarproject Briar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-33980?

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-2023-33980 published?

CVE-2023-33980 was published on 2023-05-24 and last updated on 2026-06-17.

CVE-2023-33980

CVE-2023-33980 is a high-severity vulnerability in Briarproject Briar 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Briarproject Briar
Published: 2023-05-24
Last modified: 2026-06-17

Description

Bramble Synchronisation Protocol (BSP) in Briar before 1.4.22 allows attackers to cause a denial of service (repeated application crashes) via a series of long messages to a contact.

Frequently asked questions

What is CVE-2023-33980?: Bramble Synchronisation Protocol (BSP) in Briar before 1.4.22 allows attackers to cause a denial of service (repeated application crashes) via a series of long messages to a contact.
How severe is CVE-2023-33980?: CVE-2023-33980 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-2023-33980 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-33980?: CVE-2023-33980 affects Briarproject Briar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-33980?: 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-2023-33980 published?: CVE-2023-33980 was published on 2023-05-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:briarproject:briar:*:*:*:*:*:*:*:*

More vulnerabilities in Briarproject Briar

CVE-2023-33983 — High (CVSS 7.4): The Introduction Client in Briar through 1.5.3 does not implement out-of-band verification for the public keys of…
CVE-2023-33981 — Medium (CVSS 6.5): Briar before 1.4.22 allows attackers to spoof other users' messages in a blog, forum, or private group, but each…
CVE-2023-33982 — Medium (CVSS 5.9): Bramble Handshake Protocol (BHP) in Briar before 1.5.3 is not forward secure: eavesdroppers can decrypt network traffic…

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