How severe is CVE-2021-40845?

CVE-2021-40845 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40845 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40845?

CVE-2021-40845 affects Zenitel Alphacom Xe Audio Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40845?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-40845 published?

CVE-2021-40845 was published on 2021-09-15 and last updated on 2026-06-17.

CVE-2021-40845

CVE-2021-40845 is a high-severity vulnerability in Zenitel Alphacom Xe Audio Server with a CVSS 3.x base score of 8.8. 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-434.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Zenitel Alphacom Xe Audio Server
Published: 2021-09-15
Last modified: 2026-06-17

Description

The web part of Zenitel AlphaCom XE Audio Server through 11.2.3.10, called AlphaWeb XE, does not restrict file upload in the Custom Scripts section at php/index.php. Neither the content nor extension of the uploaded files is checked, allowing execution of PHP code under the /cmd directory.

Frequently asked questions

What is CVE-2021-40845?: The web part of Zenitel AlphaCom XE Audio Server through 11.2.3.10, called AlphaWeb XE, does not restrict file upload in the Custom Scripts section at php/index.php. Neither the content nor extension of the uploaded files is checked, allowing execution of PHP code under the /cmd directory.
How severe is CVE-2021-40845?: CVE-2021-40845 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40845 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40845?: CVE-2021-40845 affects Zenitel Alphacom Xe Audio Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40845?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-40845 published?: CVE-2021-40845 was published on 2021-09-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:zenitel:alphacom_xe_audio_server:*:*:*:*:*:*:*:*

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