How severe is CVE-2023-50434?

CVE-2023-50434 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-50434 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-50434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2023-50434 have an EU (EUVD) identifier?

Yes. CVE-2023-50434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-55226.

When was CVE-2023-50434 published?

CVE-2023-50434 was published on 2024-04-29 and last updated on 2026-06-17.

CVE-2023-50434

CVE-2023-50434 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-55226
Weakness: CWE-121
Published: 2024-04-29
Last modified: 2026-06-17

Description

emdns_resolve_raw in emdns.c in emdns through fbd1eef calls strlen with an input that may not be '\0' terminated, leading to a stack-based buffer over-read. This can be triggered by a remote adversary that can send DNS requests to the emdns server. The impact could vary depending on the system libraries, compiler, and processor architecture. Code before be565c3 is unaffected.

Frequently asked questions

What is CVE-2023-50434?: emdns_resolve_raw in emdns.c in emdns through fbd1eef calls strlen with an input that may not be '\0' terminated, leading to a stack-based buffer over-read. This can be triggered by a remote adversary that can send DNS requests to the emdns server. The impact could vary depending on the system libraries, compiler, and processor architecture. Code before be565c3 is unaffected.
How severe is CVE-2023-50434?: CVE-2023-50434 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-50434 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-50434?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2023-50434 have an EU (EUVD) identifier?: Yes. CVE-2023-50434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-55226.
When was CVE-2023-50434 published?: CVE-2023-50434 was published on 2024-04-29 and last updated on 2026-06-17.

References

https://papers.mathyvanhoef.com/esorics2024.pdf

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