How severe is CVE-2021-43695?

CVE-2021-43695 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-43695 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43695?

CVE-2021-43695 affects Issabel Pbx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43695?

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

When was CVE-2021-43695 published?

CVE-2021-43695 was published on 2021-11-29 and last updated on 2026-06-17.

CVE-2021-43695

CVE-2021-43695 is a medium-severity vulnerability in Issabel Pbx with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Issabel Pbx
Published: 2021-11-29
Last modified: 2026-06-17

Description

issabelPBX version 2.11 is affected by a Cross Site Scripting (XSS) vulnerability. In file page.backup_restore.php, the exit function will terminate the script and print the message to the user. The message will contain $_REQUEST without sanitization, then there is a XSS vulnerability.

Frequently asked questions

What is CVE-2021-43695?: issabelPBX version 2.11 is affected by a Cross Site Scripting (XSS) vulnerability. In file page.backup_restore.php, the exit function will terminate the script and print the message to the user. The message will contain $_REQUEST without sanitization, then there is a XSS vulnerability.
How severe is CVE-2021-43695?: CVE-2021-43695 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-43695 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43695?: CVE-2021-43695 affects Issabel Pbx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43695?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43695 published?: CVE-2021-43695 was published on 2021-11-29 and last updated on 2026-06-17.

References

https://github.com/IssabelFoundation/issabelPBX/issues/33

Affected products (1)

cpe:2.3:a:issabel:pbx:2.11:*:*:*:*:*:*:*

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