CVE-2021-1566
Last modified
CVE-2021-1566 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. A vulnerability in the Cisco Advanced Malware Protection (AMP) for Endpoints integration of Cisco AsyncOS for Cisco Email Security Appliance (ESA) and Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to intercept traffic between an affected device and the AMP servers. This vulnerability is due to improper certificate validation when an affected device establishes TLS connections. EPSS estimates a 0.67% chance of exploitation in the next 30 days.
Description
A vulnerability in the Cisco Advanced Malware Protection (AMP) for Endpoints integration of Cisco AsyncOS for Cisco Email Security Appliance (ESA) and Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to intercept traffic between an affected device and the AMP servers. This vulnerability is due to improper certificate validation when an affected device establishes TLS connections. A man-in-the-middle attacker could exploit this vulnerability by sending a crafted TLS packet to an affected device. A successful exploit could allow the attacker to spoof a trusted host and then extract sensitive information or alter certain API requests.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Email Security Appliance | All versions |
| Cisco | Asyncos | < 12.5.3-035 |
| Cisco | Asyncos | >= 13.0, < 13.0.0-030 |
| Cisco | Asyncos | >= 13.5, < 13.5.3-010 |
| Cisco | Web Security Appliance | All versions |
| Cisco | Asyncos | < 11.8.3-021 |
| Cisco | Asyncos | >= 12.0.0, < 12.0.3-005 |
| Cisco | Asyncos | >= 12.5.0, < 12.5.1-043 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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