HOMEVULNERABILITIESCVE-2020-24340
HIGH

CVE-2020-24340

CWE-125Published: December 11, 2020· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

An issue was discovered in picoTCP and picoTCP-NG through 1.7.0. The code that processes DNS responses in pico_mdns_handle_data_as_answers_generic() in pico_mdns.c does not check whether the number of answers/responses specified in a DNS packet header corresponds to the response data available in the packet, leading to an out-of-bounds read, invalid pointer dereference, and Denial-of-Service.

NVD Source

Technical Analysis

CVE-2020-24340 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

altran2 product(s)
picotcppicotcp-ng
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
ADVISORYhttps://www.kb.cert.org/vuls/id/815128
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
ADVISORYhttps://www.kb.cert.org/vuls/id/815128

All References (4)

→
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory · US Government Resource
→
https://www.kb.cert.org/vuls/id/815128Third Party Advisory · US Government Resource
→
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory · US Government Resource
→
https://www.kb.cert.org/vuls/id/815128Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2020-24340
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected1 vendor(s)
PublishedDec 11, 2020

Related CVEs (CWE-125)

CVE-2009-2523
10.0
CVE-2021-21777
10.0
CVE-2021-41556
10.0
CVE-2017-14451
10.0
CVE-2013-0767
10.0
CVE-2026-34987
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-24340 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2020-24340·NVD