CVE-2023-50434Network attack vector

Memory disclosure via unterminated DNS input

Published Apr 29, 2024 · Updated Aug 2, 2024

Stack-based buffer over-read in emdns be565c3 through fbd1eef allows remote attackers to disclose process memory via crafted DNS requests. The emdns_resolve_raw function passes a DNS-derived buffer that may lack a null terminator to strlen, causing reads beyond the stack buffer. Any unauthenticated host able to send requests to the UDP listener can trigger the read; disclosed content varies with the libraries, compiler, and processor architecture.

CVSS severity9.8
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack-based buffer over-read in emdns be565c3 through fbd1eef allows remote attackers to disclose process memory via crafted DNS requests. The emdns_resolve_raw function passes a DNS-derived buffer that may lack a null terminator to strlen, causing reads beyond the stack buffer. Any unauthenticated host able to send requests to the UDP listener can trigger the read; disclosed content varies with the libraries, compiler, and processor architecture.

The record

CVE
CVE-2023-50434
Published
Apr 29, 2024
Updated
Aug 2, 2024
Vendor
emdns
Product
emdns
Classifications
CWE-121, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=fbd1eef

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

emdns · emdnsversion=0 <=fbd1eef

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo