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CVE-2020-3558

21
FAUCET Score

CVE-2020-3558 describes an open redirect vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) Software, allowing an unauthenticated, remote attacker to redirect users to malicious web pages. This medium-severity vulnerability (CVSS 6.1) stems from improper input validation, requiring user interaction to exploit and potentially leading to phishing attacks. While the vulnerability could result in low impact to confidentiality and integrity, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding it.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.2.0, <= 6.2.3.16CPE matchmatch criteria
cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
>= 6.3.0, <= 6.3.0.5CPE matchmatch criteria
cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
>= 6.4.0, <= 6.4.0.9CPE matchmatch criteria
cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
>= 6.5.0, <= 6.5.0.4CPE matchmatch criteria
cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.7MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 61st percentile among its peer group of 26,234 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 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-fmc-redirect-NYDuSEQn
Vendor Advisory