What is CVE-2021-40719?

CVE-2021-40719 is a critical-severity vulnerability in Adobe Connect, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-10-21.

How severe is CVE-2021-40719?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Adobe Connect

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.

Vulnerability class: Insecure Deserialization

Published 2021-10-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.035 (89.1th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.035 · newest: 0.035 · change: 0.000

Affected products

Adobe Connect — versions unspecified

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

helpx.adobe.com/security/products/connect/apsb21-91.html (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-40719?: CVE-2021-40719 is a critical-severity vulnerability in Adobe Connect, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-10-21.
How severe is CVE-2021-40719?: Critical severity. CVSS v3 base score is 9.8 out of 10.