How severe is CVE-2025-64702?

CVE-2025-64702 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-2025-64702 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-64702?

CVE-2025-64702 affects Quic-go Project Quic-go. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-64702?

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

Does CVE-2025-64702 have an EU (EUVD) identifier?

Yes. CVE-2025-64702 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202714.

When was CVE-2025-64702 published?

CVE-2025-64702 was published on 2025-12-11 and last updated on 2026-06-17.

CVE-2025-64702

CVE-2025-64702 is a medium-severity vulnerability in Quic-go Project Quic-go 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-202714
Weakness: CWE-770
Affected product: Quic-go Project Quic-go
Published: 2025-12-11
Last modified: 2026-06-17

Description

quic-go is an implementation of the QUIC protocol in Go. Versions 0.56.0 and below are vulnerable to excessive memory allocation through quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large header field section (many unique header names and/or large values). The implementation builds an http.Header (used on the http.Request and http.Response, respectively), while only enforcing limits on the size of the (QPACK-compressed) HEADERS frame, but not on the decoded header, leading to memory exhaustion. This issue is fixed in version 0.57.0.

Frequently asked questions

What is CVE-2025-64702?: quic-go is an implementation of the QUIC protocol in Go. Versions 0.56.0 and below are vulnerable to excessive memory allocation through quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large header field section (many unique header names and/or large values). The implementation builds an http.Header (used on the http.Request and http.Response, respectively), while only enforcing limits on the size of the (QPACK-compressed) HEADERS frame, but not on the decoded header, leading to memory exhaustion. This issue is fixed in version 0.57.0.
How severe is CVE-2025-64702?: CVE-2025-64702 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-2025-64702 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-64702?: CVE-2025-64702 affects Quic-go Project Quic-go. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-64702?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-64702 have an EU (EUVD) identifier?: Yes. CVE-2025-64702 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202714.
When was CVE-2025-64702 published?: CVE-2025-64702 was published on 2025-12-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:quic-go_project:quic-go:*:*:*:*:*:*:*:*

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