4thline cling uPnP protocol issue can lead to denial of service

published 2022-08-15 4y ago modified 2026-06-17 4mo ago also GHSA-c438-6f6r-pg8w , EUVD-2022-6530

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

An issue in the UPnP protocol in 4thline cling 2.0.0 through 2.1.2 allows remote attackers to cause a denial of service via an unchecked CALLBACK parameter in the request header

Patch / fix

links 1

github.com/4thline/cling/issues/253 advisory

Is CVE-2020-23622 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/4thline/cling/issues/253 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.fourthline.cling:cling-core	>=2.0.0, <=2.1.2	no fix listed

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

github.com /4thline/cling/issues/253
web, exploit, issue-tracking, patch, third-party-advisory
zh-cn.tenable.com /blog/cve-2020-12695-callstranger-vulnerability-in-universal-plug-and-play-upnp-puts-billions-of?tns_redirect=
web, not-applicable
nvd.nist.gov /vuln/detail/CVE-2020-23622
advisory
github.com /4thline/cling
package

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

json all entries feed