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CVE-2019-1884

23
FAUCET Score

CVE-2019-1884 describes a denial of service vulnerability in Cisco AsyncOS Software for Cisco Web Security Appliance (WSA). This flaw, caused by insufficient input validation in the web proxy functionality, allows an authenticated, remote attacker to send a malicious HTTP/HTTPS request, causing the device to stop processing traffic. Rated Medium with a CVSS score of 6.5, the attack requires low privileges and has a high impact on availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 10.1, < 10.5.5-005CPE matchmatch criteria
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:*
>= 11.5, < 11.5.2-020CPE matchmatch criteria
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:*
>= 11.7, < 11.7.0-407CPE matchmatch criteria
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:*
10.1.4-017CPE matchmatch criteria
cpe:2.3:a:cisco:web_security_appliance:10.1.4-017:*:*:*:*:*:*:*
10.5.2-072CPE matchmatch criteria
cpe:2.3:a:cisco:web_security_appliance:10.5.2-072:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.7HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.1
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.51%
Probability of exploitation in next 30 days
EPSS Percentile
71.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0151 is in the 85th percentile among its peer group of 21,958 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 0.0 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-20190703-asyncos-wsa
Vendor Advisory