CVE-2021-29462: DNS rebinding in pupnp

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-04-20 · updated 2026-06-17
Weakness: CWE-20

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.

Affected products

pupnp: before 1.14.6 — fixed in 1.14.6

How to fix

Upgrade to a fixed version: pupnp 1.14.6. Check the vendor advisory for mitigations.

References

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

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