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CVE-2020-23622

25
FAUCET Score

CVE-2020-23622 is a denial-of-service vulnerability affecting 4thline cling versions 2.0.0 through 2.1.2, stemming from an unchecked CALLBACK parameter in the UPnP protocol. This high-severity vulnerability (CVSS 7.5) can be exploited remotely with low attack complexity, leading to a complete denial of service. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, <= 2.1.2CPE matchmatch criteria
cpe:2.3:a:cling_project:cling:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.99%
Probability of exploitation in next 30 days
EPSS Percentile
58.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0099 is in the 34th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-c438-6f6r-pg8whigh

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

Aug 16, 2022

References

github.com / 4thline/cling/issues/253
ExploitIssue TrackingPatchThird Party Advisory
zh-cn.tenable.com / blog/cve-2020-12695-callstranger-vulnerability-in-universal-plug-and-play-upnp-puts-billions-of
Not Applicable