CVE-2020-6073Network attack vector

Service crash via TXT record integer underflows

Published Mar 24, 2020 · Updated Aug 4, 2024

Integer overflow in Videolabs libmicrodns 0.1.0 allows remote attackers to crash a consuming process via a crafted mDNS TXT record. The rr_read_TXT function subtracts an attacker-controlled string length from unsigned remaining-length counters without ensuring that the TXT RDATA contains that many bytes, causing wraparound and an eventual out-of-bounds read. Any network sender able to deliver an mDNS message to a process using the library can interrupt that process; no authentication or user interaction is required.

CVSS severity7.5
High
EPSS probability2.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Videolabs libmicrodns 0.1.0 allows remote attackers to crash a consuming process via a crafted mDNS TXT record. The rr_read_TXT function subtracts an attacker-controlled string length from unsigned remaining-length counters without ensuring that the TXT RDATA contains that many bytes, causing wraparound and an eventual out-of-bounds read. Any network sender able to deliver an mDNS message to a process using the library can interrupt that process; no authentication or user interaction is required.

The record

CVE
CVE-2020-6073
Published
Mar 24, 2020
Updated
Aug 4, 2024
Vendor
Videolabs
Product
libmicrodns
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=Videolabs libmicrodns 0.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Videolabs · libmicrodnsversion=Videolabs libmicrodns 0.1.0

Published CVSS scores

7.5Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-190Integer Overflow or Wraparound
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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