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CVE-2020-3280

33
FAUCET Score

CVE-2020-3280 is a critical vulnerability affecting Cisco Unified Contact Center Express (Unified CCX) that allows unauthenticated, remote attackers to execute arbitrary code. This flaw stems from insecure deserialization within the Java Remote Management Interface. An attacker can exploit this by sending a malicious serialized Java object, leading to root-level code execution on the affected device. With a CVSS score of 9.8 (CRITICAL), the vulnerability is easily exploitable over the network with no user interaction. While there is no known active exploitation (KEV) or public exploit code (Metasploit, Nuclei, ExploitDB), it has garnered some community discussion and media coverage, indicating awareness of its severity.

Impacted Technologies

VendorProductVersion(s)CPE
>= 12.0, < 12.0\(1\)es03CPE matchmatch criteria
cpe:2.3:a:cisco:unified_contact_center_express:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.94%
Probability of exploitation in next 30 days
EPSS Percentile
93.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0694 is in the 88th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-uccx-rce-GMSC6RKN
Vendor Advisory