How severe is CVE-2023-21416?

CVE-2023-21416 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2023-21416 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-21416?

CVE-2023-21416 primarily affects Axis Axis Os. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-21416?

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-2023-21416 published?

CVE-2023-21416 was published on 2023-11-21 and last updated on 2026-06-17.

CVE-2023-21416

CVE-2023-21416 is a high-severity vulnerability in Axis Axis Os with a CVSS 3.x base score of 7.1. 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-35.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-35
Affected product: Axis Axis Os
Published: 2023-11-21
Last modified: 2026-06-17

Description

Sandro Poppi, member of the AXIS OS Bug Bounty Program, has found that the VAPIX API dynamicoverlay.cgi was vulnerable to a Denial-of-Service attack allowing for an attacker to block access to the overlay configuration page in the web interface of the Axis device. This flaw can only be exploited after authenticating with an operator- or administrator-privileged service account however the impact is equal. Axis has released patched AXIS OS versions for the highlighted flaw. Please refer to the Axis security advisory for more information and solution.

Frequently asked questions

What is CVE-2023-21416?: Sandro Poppi, member of the AXIS OS Bug Bounty Program, has found that the VAPIX API dynamicoverlay.cgi was vulnerable to a Denial-of-Service attack allowing for an attacker to block access to the overlay configuration page in the web interface of the Axis device. This flaw can only be exploited after authenticating with an operator- or administrator-privileged service account however the impact is equal. Axis has released patched AXIS OS versions for the highlighted flaw. Please refer to the Axis security advisory for more information and solution.
How severe is CVE-2023-21416?: CVE-2023-21416 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2023-21416 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-21416?: CVE-2023-21416 primarily affects Axis Axis Os. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-21416?: 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-2023-21416 published?: CVE-2023-21416 was published on 2023-11-21 and last updated on 2026-06-17.

References

https://www.axis.com/dam/public/35/2a/a6/cve-2023-21416-en-US-417790.pdf

Affected products (2)

cpe:2.3:o:axis:axis_os:*:*:*:*:active:*:*:*
cpe:2.3:o:axis:axis_os_2022:*:*:*:*:lts:*:*:*

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