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CVE-2017-3870

22
FAUCET Score

CVE-2017-3870 describes a medium-severity vulnerability in the URL filtering feature of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA), impacting both virtual and hardware appliances configured with URL filters for email scanning. An unauthenticated, remote attacker could exploit this flaw to bypass configured URL filter rules, potentially allowing access to blocked content. The CVSSv3 score of 5.8 indicates a network-exploitable vulnerability with low attack complexity and a potential impact of low integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
8.5.3-069CPE matchmatch criteria
cpe:2.3:a:cisco:web_security_appliance:8.5.3-069:*:*:*:*:*:*:*
9.1.1-074CPE matchmatch criteria
cpe:2.3:a:cisco:web_security_appliance:9.1.1-074:*:*:*:*:*:*:*
9.1.2-010CPE matchmatch criteria
cpe:2.3:a:cisco:web_security_appliance:9.1.2-010:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.52%
Probability of exploitation in next 30 days
EPSS Percentile
72.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0152 is in the 55th percentile among its peer group of 23,725 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-20170315-wsa
Vendor Advisory
securityfocus.com / bid/96907
Third Party AdvisoryVDB Entry
securitytracker.com / id/1038043