How severe is CVE-2026-45673?

CVE-2026-45673 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-45673 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45673?

CVE-2026-45673 affects Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-45673?

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

Does CVE-2026-45673 have an EU (EUVD) identifier?

Yes. CVE-2026-45673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36445.

When was CVE-2026-45673 published?

CVE-2026-45673 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-45673

CVE-2026-45673 is a medium-severity vulnerability in Netty with a CVSS 3.x base score of 6.8. 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-330.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36445
Weakness: CWE-330
Affected product: Netty
Published: 2026-06-12
Last modified: 2026-06-17

Description

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Frequently asked questions

What is CVE-2026-45673?: Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.
How severe is CVE-2026-45673?: CVE-2026-45673 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-45673 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45673?: CVE-2026-45673 affects Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-45673?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45673 have an EU (EUVD) identifier?: Yes. CVE-2026-45673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36445.
When was CVE-2026-45673 published?: CVE-2026-45673 was published on 2026-06-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

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