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CVE-2020-3370

20
FAUCET Score

CVE-2020-3370 describes a URL filtering bypass vulnerability in Cisco Content Security Management Appliance (SMA) and Email Security Appliance. This medium-severity vulnerability (CVSS 5.8) stems from insufficient input validation, allowing an unauthenticated, remote attacker to redirect users to malicious sites via a crafted HTTP request. While the attack complexity is low, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 13.0.1CPE matchmatch criteria
cpe:2.3:a:cisco:email_security_appliance:*:*:*:*:*:*:*:*
>= 13.5.0, < 13.5.1CPE matchmatch criteria
cpe:2.3:a:cisco:email_security_appliance:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

4.0MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 47th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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-ESA-filt-39jXvMfM
Vendor Advisory