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CVE-2021-1393

31
FAUCET Score

CVE-2021-1393 describes multiple critical vulnerabilities in Cisco Application Services Engine and Application Policy Infrastructure Controller. These flaws allow unauthenticated, remote attackers to gain privileged access to host-level operations, retrieve sensitive device information, create diagnostic files, and make limited configuration changes. With a CVSS score of 9.8 (CRITICAL), the vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the CVE has garnered significant community discussion and media coverage, indicating high awareness and potential for future exploitation.

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
2.25%
Probability of exploitation in next 30 days
EPSS Percentile
81.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0225 is in the 70th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 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