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Medium severity5.9NVD Advisory· Published Dec 14, 2016· Updated May 6, 2026

CVE-2016-1411

CVE-2016-1411

Description

Cisco AsyncOS update functionality lacks certificate validation, allowing MITM attackers to impersonate the update server and potentially deliver malicious updates.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Cisco AsyncOS update functionality lacks certificate validation, allowing MITM attackers to impersonate the update server and potentially deliver malicious updates.

Vulnerability

The update functionality in Cisco AsyncOS Software for Cisco Email Security Appliance (ESA), Cisco Web Security Appliance (WSA), and Cisco Content Management Security Appliance (SMA) contains a vulnerability due to a lack of certificate validation during HTTPS connections to the update manifest repository [1]. This affects multiple software releases, including 7.5.2-201, 7.6.3-025, 8.0.1-023, 8.5.0-000, and others [1].

Exploitation

An unauthenticated, remote attacker can exploit this vulnerability by performing a man-in-the-middle attack, such as DNS hijacking, to impersonate the update server [1]. The attacker intercepts the HTTPS connection and presents a fake certificate, which the appliance does not validate, allowing the attacker to serve arbitrary content [1].

Impact

Successful exploitation allows the attacker to deliver malicious updates to the affected appliance. This could lead to full compromise of the device, impacting confidentiality, integrity, and availability [1].

Mitigation

Cisco has released fixed software versions to address this vulnerability, including 8.0.2-069, 8.0.2-074, 8.5.7-042, 9.1.0-032, 8.5.2-027, and 9.6.1-019 [1]. There are no workarounds for this vulnerability [1]. Users should upgrade to a fixed release as soon as possible.

References
  1. Cisco Security Advisory: Cisco Security Appliances AsyncOS Software Update Server Certificate Validation Vulnerability

AI Insight generated on May 23, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

19
  • Cisco Systems, Inc./Content Security Management Appliance6 versions
    cpe:2.3:a:cisco:content_security_management_appliance:9.1.0:*:*:*:*:*:*:*+ 5 more
    • cpe:2.3:a:cisco:content_security_management_appliance:9.1.0:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-004:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-031:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-033:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-103:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:content_security_management_appliance:9.6.0:*:*:*:*:*:*:*
  • Cisco Systems, Inc./Email Security Appliance Firmware8 versions
    cpe:2.3:a:cisco:email_security_appliance:7.5.2-201:*:*:*:*:*:*:*+ 7 more
    • cpe:2.3:a:cisco:email_security_appliance:7.5.2-201:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:email_security_appliance:7.5.2-hp2-303:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:email_security_appliance:7.6.3-025:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:email_security_appliance:8.0.1-023:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:email_security_appliance:8.5.0-000:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:email_security_appliance:8.5.0-er1-198:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:email_security_appliance:8.5.1-021:*:*:*:*:*:*:*
    • (no CPE)range: 7.5.2-201 / 7.6.3-025 / 8.0.1-023 / 8.5.0-000 / 8.5.0-ER1-198 / 7.5.2-HP2-303 / 7.7.0-608 / 7.7.5-021 / 8.8.0-000 / 7.9.1-102 / 8.0.0-404 / 8.1.1-013 / 8.2.0-222
  • Cisco Systems, Inc./Web Security Appliance3 versions
    cpe:2.3:a:cisco:web_security_appliance:7.7.0-608:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:cisco:web_security_appliance:7.7.0-608:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:web_security_appliance:7.7.5-835:*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:web_security_appliance:8.8.0-000:*:*:*:*:*:*:*
  • Cisco Systems, Inc./Content Security Management Appliance (sma)llm-create
    Range: 7.5.2-201 / 7.6.3-025 / 8.0.1-023 / 8.5.0-000 / 8.5.0-ER1-198 / 7.5.2-HP2-303 / 7.7.0-608 / 7.7.5-021 / 8.8.0-000 / 7.9.1-102 / 8.0.0-404 / 8.1.1-013 / 8.2.0-222
  • Cisco Systems, Inc./AsyncOS Software for Web Security Appliances (WSA)llm-fuzzy
    Range: 7.5.2-201 / 7.6.3-025 / 8.0.1-023 / 8.5.0-000 / 8.5.0-ER1-198 / 7.5.2-HP2-303 / 7.7.0-608 / 7.7.5-021 / 8.8.0-000 / 7.9.1-102 / 8.0.0-404 / 8.1.1-013 / 8.2.0-222

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

2

News mentions

0

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