How severe is CVE-2018-4921?

CVE-2018-4921 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-4921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4921?

CVE-2018-4921 affects Adobe Connect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4921?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-4921 published?

CVE-2018-4921 was published on 2018-05-19 and last updated on 2026-06-17.

CVE-2018-4921

CVE-2018-4921 is a medium-severity vulnerability in Adobe Connect with a CVSS 3.x base score of 6.1. 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-434.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Adobe Connect
Published: 2018-05-19
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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.
How severe is CVE-2018-4921?: CVE-2018-4921 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-4921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4921?: CVE-2018-4921 affects Adobe Connect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4921?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-4921 published?: CVE-2018-4921 was published on 2018-05-19 and last updated on 2026-06-17.

References

Affected products (1)

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

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Other CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities

CVE-2026-39770 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in Doctreat <= 1.7.0 versions.
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CVE-2026-102427 — Critical (CVSS 10.0): Joomla Extension - ordasoft.com - Unauthenticated Remote Code Execution in OrdaSoft Joomla CCK < 8.3.16 -…
CVE-2026-4357 — Critical (CVSS 10.0): The Embed HTML5 Game WordPress plugin through 1.3 does not properly restrict who can upload files via the plugin, as…
CVE-2026-84147 — Critical (CVSS 10.0): This vulnerability exists in the ERP system due to improper authentication controls and inadequate file type validation…
CVE-2026-81780 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in Hash Form <= 1.4.2 versions.

Browse all CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities →