CVE-2021-29462

Name: CVE-2021-29462
Creator: NVD / NIST
Published: 2021-04-20T21:15:08.493+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.63%

Last modified Jun 17, 2026

CVE-2021-29462 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.63% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.63%

45.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Pupnp Project	Pupnp	< 1.14.6

References

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

Timeline

Published: Apr 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29462?

How severe is CVE-2021-29462?

CVE-2021-29462 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29462?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-29462?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST