How severe is CVE-2021-37459?

CVE-2021-37459 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-37459 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37459?

CVE-2021-37459 affects Nchsoftware Axon Pbx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-37459?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-37459 published?

CVE-2021-37459 was published on 2021-07-25 and last updated on 2026-06-17.

CVE-2021-37459

CVE-2021-37459 is a medium-severity vulnerability in Nchsoftware Axon Pbx with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Nchsoftware Axon Pbx
Published: 2021-07-25
Last modified: 2026-06-17

Description

Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via the customer name field (stored).

Frequently asked questions

What is CVE-2021-37459?: Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via the customer name field (stored).
How severe is CVE-2021-37459?: CVE-2021-37459 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-37459 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37459?: CVE-2021-37459 affects Nchsoftware Axon Pbx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-37459?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-37459 published?: CVE-2021-37459 was published on 2021-07-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nchsoftware:axon_pbx:*:*:*:*:*:*:*:*

More vulnerabilities in Nchsoftware Axon Pbx

CVE-2021-37462 — Medium (CVSS 5.4): Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via /ipblacklist?errorip= (reflected).
CVE-2021-37461 — Medium (CVSS 5.4): Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via /extensionsinstruction?id= (reflected).
CVE-2021-37460 — Medium (CVSS 5.4): Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via /planprop?id= (reflected).
CVE-2021-37458 — Medium (CVSS 5.4): Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via the primary phone field (stored).
CVE-2021-37457 — Medium (CVSS 5.4): Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via the SipRule field (stored).
CVE-2021-37456 — Medium (CVSS 5.4): Cross Site Scripting (XSS) exists in NCH Axon PBX v2.22 and earlier via the blacklist IP address (stored).

All CVEs affecting Nchsoftware Axon Pbx →

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