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CVE-2021-1396

21
FAUCET Score

CVE-2021-1396 describes multiple vulnerabilities in Cisco Application Services Engine and Cisco Application Policy Infrastructure Controller. An unauthenticated, remote attacker could exploit these flaws to gain privileged access to host operations, retrieve device information, create diagnostic files, or make limited configuration changes. With a CVSS score of 6.5 (Medium), the attack vector is network-based with low complexity and no user interaction required, potentially leading to information disclosure and limited integrity impact. While the EPSS score is low and it's not listed in CISA's KEV catalog, there is some media coverage and community discussion, though no public exploit code (Metasploit, Nuclei, ExploitDB) is currently available.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.1, < 1.1\(3e\)CPE matchmatch criteria
cpe:2.3:a:cisco:application_services_engine:*:*:*:*:*:*:*:*
1.1.3CPE matchmatch criteria
cpe:2.3:a:cisco:application_policy_infrastructure_controller:1.1.3:c:*:*:*:*:*:*
1.1.3CPE matchmatch criteria
cpe:2.3:a:cisco:application_policy_infrastructure_controller:1.1.3:d:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.01%
Probability of exploitation in next 30 days
EPSS Percentile
59.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0101 is in the 37th percentile among its peer group of 23,705 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

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-case-mvuln-dYrDPC6w
Vendor Advisory