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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-1220

Multiple vulnerabilities in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker with read-only privileges to cause the web UI software to become unresponsive and consume vty line instances, resulting in a denial of service (DoS) condition. These vulnerabilities are due to insufficient error handling in the web UI. An attacker could exploit these vulnerabilities by sending crafted HTTP packets to an affected device. A successful exploit could allow the attacker to cause the web UI software to become unresponsive and consume all available vty lines, preventing new session establishment and resulting in a DoS condition. Manual intervention would be required to regain web UI and vty session functionality. Note: These vulnerabilities do not affect the console connection.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 42.9%
CVSS Severity
CVSS v3 Score 4.3
CVSS v2 Score 3.5
Products affected by CVE-2021-1220
  • Cisco » Ios Xe » Version: 16.11.1
    cpe:2.3:o:cisco:ios_xe:16.11.1
  • Cisco » Ios Xe » Version: 16.11.1a
    cpe:2.3:o:cisco:ios_xe:16.11.1a
  • Cisco » Ios Xe » Version: 16.11.1b
    cpe:2.3:o:cisco:ios_xe:16.11.1b
  • Cisco » Ios Xe » Version: 16.11.1c
    cpe:2.3:o:cisco:ios_xe:16.11.1c
  • Cisco » Ios Xe » Version: 16.11.1s
    cpe:2.3:o:cisco:ios_xe:16.11.1s
  • Cisco » Ios Xe » Version: 16.11.2
    cpe:2.3:o:cisco:ios_xe:16.11.2
  • Cisco » Ios Xe » Version: 16.12.1
    cpe:2.3:o:cisco:ios_xe:16.12.1
  • Cisco » Ios Xe » Version: 16.12.1a
    cpe:2.3:o:cisco:ios_xe:16.12.1a
  • Cisco » Ios Xe » Version: 16.12.1c
    cpe:2.3:o:cisco:ios_xe:16.12.1c
  • Cisco » Ios Xe » Version: 16.12.1s
    cpe:2.3:o:cisco:ios_xe:16.12.1s
  • Cisco » Ios Xe » Version: 16.12.1t
    cpe:2.3:o:cisco:ios_xe:16.12.1t
  • Cisco » Ios Xe » Version: 16.12.1w
    cpe:2.3:o:cisco:ios_xe:16.12.1w
  • Cisco » Ios Xe » Version: 16.12.1x
    cpe:2.3:o:cisco:ios_xe:16.12.1x
  • Cisco » Ios Xe » Version: 16.12.1y
    cpe:2.3:o:cisco:ios_xe:16.12.1y
  • Cisco » Ios Xe » Version: 16.12.1z
    cpe:2.3:o:cisco:ios_xe:16.12.1z
  • Cisco » Ios Xe » Version: 16.12.2
    cpe:2.3:o:cisco:ios_xe:16.12.2
  • Cisco » Ios Xe » Version: 16.12.2a
    cpe:2.3:o:cisco:ios_xe:16.12.2a
  • Cisco » Ios Xe » Version: 16.12.2s
    cpe:2.3:o:cisco:ios_xe:16.12.2s
  • Cisco » Ios Xe » Version: 16.12.2t
    cpe:2.3:o:cisco:ios_xe:16.12.2t
  • Cisco » Ios Xe » Version: 16.12.3
    cpe:2.3:o:cisco:ios_xe:16.12.3
  • Cisco » Ios Xe » Version: 16.12.3a
    cpe:2.3:o:cisco:ios_xe:16.12.3a
  • Cisco » Ios Xe » Version: 16.12.3s
    cpe:2.3:o:cisco:ios_xe:16.12.3s
  • Cisco » Ios Xe » Version: 16.12.4
    cpe:2.3:o:cisco:ios_xe:16.12.4
  • Cisco » Ios Xe » Version: 16.12.4a
    cpe:2.3:o:cisco:ios_xe:16.12.4a
  • Cisco » Ios Xe » Version: 17.1.1
    cpe:2.3:o:cisco:ios_xe:17.1.1
  • Cisco » Ios Xe » Version: 17.1.1a
    cpe:2.3:o:cisco:ios_xe:17.1.1a
  • Cisco » Ios Xe » Version: 17.1.1s
    cpe:2.3:o:cisco:ios_xe:17.1.1s
  • Cisco » Ios Xe » Version: 17.1.1t
    cpe:2.3:o:cisco:ios_xe:17.1.1t
  • Cisco » Ios Xe » Version: 17.1.2
    cpe:2.3:o:cisco:ios_xe:17.1.2
  • Cisco » Ios Xe » Version: 17.2.1
    cpe:2.3:o:cisco:ios_xe:17.2.1
  • Cisco » Ios Xe » Version: 17.2.1a
    cpe:2.3:o:cisco:ios_xe:17.2.1a
  • Cisco » Ios Xe » Version: 17.2.1r
    cpe:2.3:o:cisco:ios_xe:17.2.1r
  • Cisco » Ios Xe » Version: 17.2.1v
    cpe:2.3:o:cisco:ios_xe:17.2.1v
  • Cisco » Ios Xe » Version: 3.15.1xbs
    cpe:2.3:o:cisco:ios_xe:3.15.1xbs
  • Cisco » Ios Xe » Version: 3.15.2xbs
    cpe:2.3:o:cisco:ios_xe:3.15.2xbs


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