CVE-2020-6079Network attack vector

Service crash via rr_decode memory leak

Published Mar 24, 2020 · Updated Aug 4, 2024

Resource exhaustion in Videolabs libmicrodns 0.1.0 allows remote attackers to crash a consuming service with repeated mDNS messages. rr_decode allocates entry->name, but rr_read returns after a type-specific parser rejects an invalid SRV, PTR, TXT, AAAA, or A record without freeing that buffer. No authentication or user interaction is required, and repetition exhausts process memory until the embedding service crashes.

CVSS severity7.5
High
EPSS probability3.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Videolabs libmicrodns 0.1.0 allows remote attackers to crash a consuming service with repeated mDNS messages. rr_decode allocates entry->name, but rr_read returns after a type-specific parser rejects an invalid SRV, PTR, TXT, AAAA, or A record without freeing that buffer. No authentication or user interaction is required, and repetition exhausts process memory until the embedding service crashes.

The record

CVE
CVE-2020-6079
Published
Mar 24, 2020
Updated
Aug 4, 2024
Vendor
Videolabs
Product
libmicrodns
Classifications
CWE-401, T1499.002
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
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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-401Missing Release of Memory after Effective Lifetime
T1499.002Service Exhaustion

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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