HOMEVULNERABILITIESCVE-2021-29462
CRITICAL

CVE-2021-29462

CWE-20Published: April 20, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The Portable SDK for UPnP Devices is an SDK for development of UPnP device and control point applications. The server part of pupnp (libupnp) appears to be vulnerable to DNS rebinding attacks because it does not check the value of the `Host` header. This can be mitigated by using DNS revolvers which block DNS-rebinding attacks. The vulnerability is fixed in version 1.14.6 and later.

NVD Source

Technical Analysis

CVE-2021-29462 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

pupnp_project1 product(s)
pupnp
Source: NVD CPE · 1 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
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Official Patches & Advisories

ADVISORYhttp://www.openwall.com/lists/oss-security/2021/04/20/4
ADVISORYhttps://github.com/pupnp/pupnp/security/advisories/GHSA-6hqq-w3jq-9fhg
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/04/20/4
ADVISORYhttps://github.com/pupnp/pupnp/security/advisories/GHSA-6hqq-w3jq-9fhg

All References (4)

→
http://www.openwall.com/lists/oss-security/2021/04/20/4Mailing List · Third Party Advisory
→
https://github.com/pupnp/pupnp/security/advisories/GHSA-6hqq-w3jq-9fhgThird Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/04/20/4Mailing List · Third Party Advisory
→
https://github.com/pupnp/pupnp/security/advisories/GHSA-6hqq-w3jq-9fhgThird Party Advisory

Quick Facts

CVE IDCVE-2021-29462
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedApr 20, 2021

Related CVEs (CWE-20)

CVE-2020-12389
10.0
CVE-2021-21321
10.0
CVE-2020-6962
10.0
CVE-2020-12388
10.0
CVE-2020-13753
10.0
CVE-2008-6826
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-29462 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. CVE data is provided under the NVD usage policy.
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