Vulnerability Database

383,371

Total vulnerabilities in the database

CVE-2021-1392 — cisco / ios

Insufficiently Protected Credentials

A vulnerability in the CLI command permissions of Cisco IOS and Cisco IOS XE Software could allow an authenticated, local attacker to retrieve the password for Common Industrial Protocol (CIP) and then remotely configure the device as an administrative user. This vulnerability exists because incorrect permissions are associated with the show cip security CLI command. An attacker could exploit this vulnerability by issuing the command to retrieve the password for CIP on an affected device. A successful exploit could allow the attacker to reconfigure the device.

  • Published: Mar 24, 2021
  • Updated: Sep 13, 2026
  • CVE: CVE-2021-1392
  • Severity: High
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: High
  • Score: 7.8
  • AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

  • Severity: Low
  • Score: 2.1
  • AV:L/AC:L/Au:N/C:P/I:N/A:N
Software Affected versions
cisco / ios = 15.0(1)ey
cisco / ios = 15.0(1)ey1
cisco / ios = 15.0(1)ey2
cisco / ios = 15.1(3)svs
cisco / ios = 15.1(3)svt1
cisco / ios = 15.2(1)ey
cisco / ios = 15.2(2)e
cisco / ios = 15.2(2)e1
cisco / ios = 15.2(2)e2
cisco / ios = 15.2(2)e3
cisco / ios = 15.2(2)e4
cisco / ios = 15.2(2)e5
cisco / ios = 15.2(2)e5a
cisco / ios = 15.2(2)e5b
cisco / ios = 15.2(2)e6
cisco / ios = 15.2(2)e7
cisco / ios = 15.2(2)e7b
cisco / ios = 15.2(2)e8
cisco / ios = 15.2(2)e9
cisco / ios = 15.2(2)e10
cisco / ios = 15.2(2)ea
cisco / ios = 15.2(2)ea1
cisco / ios = 15.2(2)ea2
cisco / ios = 15.2(2)ea3
cisco / ios = 15.2(2)eb
cisco / ios = 15.2(2)eb1
cisco / ios = 15.2(2)eb2
cisco / ios = 15.2(2a)e2
cisco / ios = 15.2(2b)e
cisco / ios = 15.2(3)e1
cisco / ios = 15.2(3)e2
cisco / ios = 15.2(3)e3
cisco / ios = 15.2(3)e4
cisco / ios = 15.2(3)e5
cisco / ios = 15.2(3)ea
cisco / ios = 15.2(4)e5a
cisco / ios = 15.2(4)ea
cisco / ios = 15.2(4)ea1
cisco / ios = 15.2(4)ea2
cisco / ios = 15.2(4)ea3
cisco / ios = 15.2(4)ea4
cisco / ios = 15.2(4)ea5
cisco / ios = 15.2(4)ea6
cisco / ios = 15.2(4)ea7
cisco / ios = 15.2(4)ea8
cisco / ios = 15.2(4)ea9
cisco / ios = 15.2(4)ea9a
cisco / ios = 15.2(4)ea10
cisco / ios = 15.2(4)ec1
cisco / ios = 15.2(4)ec2
cisco / ios = 15.2(4)jaz
cisco / ios = 15.2(5)e
cisco / ios = 15.2(5)e1
cisco / ios = 15.2(5)e2
cisco / ios = 15.2(5)e2b
cisco / ios = 15.2(5)e2c
cisco / ios = 15.2(5)ea
cisco / ios = 15.2(5a)e1
cisco / ios = 15.2(6)e
cisco / ios = 15.2(6)e0a
cisco / ios = 15.2(6)e0c
cisco / ios = 15.2(6)e1
cisco / ios = 15.2(6)e1a
cisco / ios = 15.2(6)e1s
cisco / ios = 15.2(7)e0b
cisco / ios = 15.2(7a)e0b
cisco / ios = 15.2(7b)e0b
cisco / ios = 15.3(3)ja1
cisco / ios = 15.3(3)ja4
cisco / ios = 15.3(3)ja5
cisco / ios = 15.3(3)ja6
cisco / ios = 15.3(3)ja7
cisco / ios = 15.3(3)ja8
cisco / ios = 15.3(3)ja10
cisco / ios = 15.3(3)ja11
cisco / ios = 15.3(3)ja12
cisco / ios = 15.3(3)jaa
cisco / ios = 15.3(3)jax
cisco / ios = 15.3(3)jax1
cisco / ios = 15.3(3)jax2
cisco / ios = 15.3(3)jb
cisco / ios = 15.3(3)jbb
cisco / ios = 15.3(3)jbb1
cisco / ios = 15.3(3)jbb2
cisco / ios = 15.3(3)jbb4
cisco / ios = 15.3(3)jbb5
cisco / ios = 15.3(3)jbb6
cisco / ios = 15.3(3)jbb6a
cisco / ios = 15.3(3)jbb8
cisco / ios = 15.3(3)jc
cisco / ios = 15.3(3)jc1
cisco / ios = 15.3(3)jc2
cisco / ios = 15.3(3)jc3
cisco / ios = 15.3(3)jc4
cisco / ios = 15.3(3)jc5
cisco / ios = 15.3(3)jc6
cisco / ios = 15.3(3)jc8
cisco / ios = 15.3(3)jc9
cisco / ios = 15.3(3)jc14
cisco / ios = 15.3(3)jd
cisco / ios = 15.3(3)jd2
cisco / ios = 15.3(3)jd3
cisco / ios = 15.3(3)jd4
cisco / ios = 15.3(3)jd5
cisco / ios = 15.3(3)jd6
cisco / ios = 15.3(3)jd7
cisco / ios = 15.3(3)jd8
cisco / ios = 15.3(3)jd9
cisco / ios = 15.3(3)jd11
cisco / ios = 15.3(3)jd12
cisco / ios = 15.3(3)jd13
cisco / ios = 15.3(3)jd14
cisco / ios = 15.3(3)jd16
cisco / ios = 15.3(3)jd17
cisco / ios = 15.3(3)je
cisco / ios = 15.3(3)jf
cisco / ios = 15.3(3)jf1
cisco / ios = 15.3(3)jf2
cisco / ios = 15.3(3)jf4
cisco / ios = 15.3(3)jf5
cisco / ios = 15.3(3)jf6
cisco / ios = 15.3(3)jf7
cisco / ios = 15.3(3)jf8
cisco / ios = 15.3(3)jf9
cisco / ios = 15.3(3)jf10
cisco / ios = 15.3(3)jf11
cisco / ios = 15.3(3)jf12
cisco / ios = 15.3(3)jf12i
cisco / ios = 15.3(3)jf13
cisco / ios = 15.3(3)jg
cisco / ios = 15.3(3)jg1
cisco / ios = 15.3(3)jh
cisco / ios = 15.3(3)jh1
cisco / ios = 15.3(3)ji1
cisco / ios = 15.3(3)ji3
cisco / ios = 15.3(3)ji4
cisco / ios = 15.3(3)ji5
cisco / ios = 15.3(3)ji6
cisco / ios = 15.3(3)jj
cisco / ios = 15.3(3)jj1
cisco / ios = 15.3(3)jk
cisco / ios = 15.3(3)jk1
cisco / ios = 15.3(3)jk1t
cisco / ios = 15.3(3)jk2
cisco / ios = 15.3(3)jk2a
cisco / ios = 15.3(3)jk3
cisco / ios = 15.3(3)jk4
cisco / ios = 15.3(3)jn
cisco / ios = 15.3(3)jn3
cisco / ios = 15.3(3)jn4
cisco / ios = 15.3(3)jn6
cisco / ios = 15.3(3)jn7
cisco / ios = 15.3(3)jn8
cisco / ios = 15.3(3)jn9
cisco / ios = 15.3(3)jn11
cisco / ios = 15.3(3)jn13
cisco / ios = 15.3(3)jn14
cisco / ios = 15.3(3)jn15
cisco / ios = 15.3(3)jnb
cisco / ios = 15.3(3)jnb1
cisco / ios = 15.3(3)jnb2
cisco / ios = 15.3(3)jnb3
cisco / ios = 15.3(3)jnb4
cisco / ios = 15.3(3)jnb5
cisco / ios = 15.3(3)jnb6
cisco / ios = 15.3(3)jnc
cisco / ios = 15.3(3)jnc1
cisco / ios = 15.3(3)jnc2
cisco / ios = 15.3(3)jnc3
cisco / ios = 15.3(3)jnc4
cisco / ios = 15.3(3)jnd
cisco / ios = 15.3(3)jnd1
cisco / ios = 15.3(3)jnd2
cisco / ios = 15.3(3)jnd3
cisco / ios = 15.3(3)jnp
cisco / ios = 15.3(3)jnp1
cisco / ios = 15.3(3)jnp3
cisco / ios = 15.3(3)jpb
cisco / ios = 15.3(3)jpb1
cisco / ios = 15.3(3)jpc
cisco / ios = 15.3(3)jpc1
cisco / ios = 15.3(3)jpc2
cisco / ios = 15.3(3)jpc3
cisco / ios = 15.3(3)jpc5
cisco / ios = 15.3(3)jpd
cisco / ios_xe = 3.3.0xo
cisco / ios_xe = 3.3.1xo
cisco / ios_xe = 3.3.2xo
cisco / ios_xe = 3.6.5be
cisco / ios_xe = 3.7.4e
cisco / ios_xe = 3.7.5e
cisco / ios_xe = 16.9.1
cisco / ios_xe = 16.9.1d
cisco / ios_xe = 16.10.1
cisco / ios_xe = 16.10.1e
cisco / ios_xe = 16.11.1
cisco / ios_xe = 16.11.1a
cisco / ios_xe = 16.11.1c
cisco / ios_xe = 16.11.1s
cisco / ios_xe = 16.11.2
cisco / ios_xe = 16.12.1
cisco / ios_xe = 16.12.1c
cisco / ios_xe = 16.12.1s
cisco / ios_xe = 16.12.2
cisco / ios_xe = 16.12.2s
cisco / ios_xe = 16.12.2t
cisco / ios_xe = 16.12.3
cisco / ios_xe = 16.12.3s
cisco / ios_xe = 16.12.4
cisco / ios_xe = 17.1.1
cisco / ios_xe = 17.1.1s
cisco / ios_xe = 17.1.1t
cisco / ios_xe = 17.1.2
cisco / ios_xe = 17.2.1

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.