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CVE-2021-37461

20
FAUCET Score

CVE-2021-37461 describes a reflected Cross-Site Scripting (XSS) vulnerability present in NCH Axon PBX version 2.22 and earlier, specifically exploitable via the /extensionsinstruction?id= parameter. This medium-severity vulnerability (CVSS 5.4) requires user interaction and local access to the network, potentially leading to limited impact on confidentiality and integrity. There is currently no evidence of active exploitation, and no public exploit code or significant community discussion has been identified.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.22CPE matchmatch criteria
cpe:2.3:a:nchsoftware:axon_pbx:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.59%
Probability of exploitation in next 30 days
EPSS Percentile
44.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0059 is in the 72nd percentile among its peer group of 15,239 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

github.com / 0xfml/poc/blob/main/NCH/Axon_2.22_XSS.md
ExploitThird Party Advisory
nch.com.au / pbx/index.html
Product