How severe is CVE-2025-1948?

CVE-2025-1948 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-2025-1948 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-1948?

CVE-2025-1948 affects Eclipse Jetty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-1948?

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.

Does CVE-2025-1948 have an EU (EUVD) identifier?

Yes. CVE-2025-1948 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14031.

When was CVE-2025-1948 published?

CVE-2025-1948 was published on 2025-05-08 and last updated on 2026-06-17.

CVE-2025-1948

CVE-2025-1948 is a high-severity vulnerability in Eclipse Jetty 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% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14031
Weakness: CWE-400
Affected product: Eclipse Jetty
Published: 2025-05-08
Last modified: 2026-06-17

Description

In Eclipse Jetty versions 12.0.0 to 12.0.16 included, an HTTP/2 client can specify a very large value for the HTTP/2 settings parameter SETTINGS_MAX_HEADER_LIST_SIZE. The Jetty HTTP/2 server does not perform validation on this setting, and tries to allocate a ByteBuffer of the specified capacity to encode HTTP responses, likely resulting in OutOfMemoryError being thrown, or even the JVM process exiting.

Frequently asked questions

What is CVE-2025-1948?: In Eclipse Jetty versions 12.0.0 to 12.0.16 included, an HTTP/2 client can specify a very large value for the HTTP/2 settings parameter SETTINGS_MAX_HEADER_LIST_SIZE. The Jetty HTTP/2 server does not perform validation on this setting, and tries to allocate a ByteBuffer of the specified capacity to encode HTTP responses, likely resulting in OutOfMemoryError being thrown, or even the JVM process exiting.
How severe is CVE-2025-1948?: CVE-2025-1948 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-2025-1948 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-1948?: CVE-2025-1948 affects Eclipse Jetty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-1948?: 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.
Does CVE-2025-1948 have an EU (EUVD) identifier?: Yes. CVE-2025-1948 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14031.
When was CVE-2025-1948 published?: CVE-2025-1948 was published on 2025-05-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eclipse:jetty:*:*:*:*:*:*:*:*

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