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CVE-2016-6399

21
FAUCET Score

CVE-2016-6399 describes a denial-of-service vulnerability affecting Cisco ACE30 and ACE 4700 Application Control Engine appliances through A5 3.3. Remote attackers can trigger a device reload by sending crafted SSL or TLS packets. With a CVSS v3 score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with low attack complexity, leading to high availability impact. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered some community discussion and media coverage, indicating awareness.

Impacted Technologies

VendorProductVersion(s)CPE
7aCPE matchmatch criteria
cpe:2.3:a:cisco:ace_application_control_engine_module_a1:7a:*:*:*:*:*:*:*
7bCPE matchmatch criteria
cpe:2.3:a:cisco:ace_application_control_engine_module_a1:7b:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:a:cisco:ace_application_control_engine_module_a1:8.0:*:*:*:*:*:*:*
8.0aCPE matchmatch criteria
cpe:2.3:a:cisco:ace_application_control_engine_module_a1:8.0a:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:cisco:ace_application_control_engine_module_a3:1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.94%
Probability of exploitation in next 30 days
EPSS Percentile
78.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0194 is in the 61st percentile among its peer group of 51,466 CVEs.

Social Chatter

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

Media Mentions

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-20160908-ace
Vendor Advisory
securityfocus.com / bid/92867
securitytracker.com / id/1036748