How severe is CVE-2021-40719?

CVE-2021-40719 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40719 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40719?

CVE-2021-40719 affects Adobe Connect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40719?

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

When was CVE-2021-40719 published?

CVE-2021-40719 was published on 2021-10-21 and last updated on 2026-06-17.

CVE-2021-40719

CVE-2021-40719 is a critical-severity vulnerability in Adobe Connect with a CVSS 3.x base score of 9.8. 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Adobe Connect
Published: 2021-10-21
Last modified: 2026-06-17

Description

Adobe Connect version 11.2.3 (and earlier) is affected by a Deserialization of Untrusted Data vulnerability to achieve arbitrary method invocation when AMF messages are deserialized on an Adobe Connect server. An attacker can leverage this to execute remote code execution on the server.

Frequently asked questions

What is CVE-2021-40719?: Adobe Connect version 11.2.3 (and earlier) is affected by a Deserialization of Untrusted Data vulnerability to achieve arbitrary method invocation when AMF messages are deserialized on an Adobe Connect server. An attacker can leverage this to execute remote code execution on the server.
How severe is CVE-2021-40719?: CVE-2021-40719 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40719 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40719?: CVE-2021-40719 affects Adobe Connect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40719?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-40719 published?: CVE-2021-40719 was published on 2021-10-21 and last updated on 2026-06-17.

References

https://helpx.adobe.com/security/products/connect/apsb21-91.html

Affected products (1)

cpe:2.3:a:adobe:connect:*:*:*:*:*:*:*:*

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