What is CVE-2018-4921?

CVE-2018-4921 is a medium-severity vulnerability in Adobe Connect, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.1/10. Published 2018-05-19.

How severe is CVE-2018-4921?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Arbitrary file upload in Adobe Connect

CVE-2018-4921

Adobe Connect versions 9.7 and earlier have an exploitable unrestricted SWF file upload vulnerability. Successful exploitation could lead to information disclosure.

Vulnerability class: Unrestricted File Upload

Published 2018-05-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.035 (88.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.042 · newest: 0.035 · change: -0.007

Affected products

Adobe Connect
Adobe Connect 9.7 And Earlier — versions Adobe Connect 9.7 and earlier

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.securitytracker.com/id/1040523 (VDB Entry, Third Party Advisory, vdb-entry)
helpx.adobe.com/security/products/connect/apsb18-06.html (Vendor Advisory)
www.securityfocus.com/bid/103393 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-4921?: CVE-2018-4921 is a medium-severity vulnerability in Adobe Connect, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.1/10. Published 2018-05-19.
How severe is CVE-2018-4921?: Medium severity. CVSS v3 base score is 6.1 out of 10.