Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2021-1391

A vulnerability in the dragonite debugger of Cisco IOS XE Software could allow an authenticated, local attacker to escalate from privilege level 15 to root privilege. The vulnerability is due to the presence of development testing and verification scripts that remained on the device. An attacker could exploit this vulnerability by bypassing the consent token mechanism with the residual scripts on the affected device. A successful exploit could allow the attacker to escalate from privilege level 15 to root privilege.

  • Published: Mar 24, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-1391
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.1
  • AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N

CVSS v2:

  • Severity: High
  • Score: 7.2
  • AV:L/AC:L/Au:N/C:C/I:C/A:C

CWEs:

Software From Fixed in
cisco / ios_xe 3.9.0e 3.9.0e.x
cisco / ios 15.2(5a)e1 15.2(5a)e1.x
cisco / ios 15.2(5)ea 15.2(5)ea.x
cisco / ios 15.2(5c)e 15.2(5c)e.x
cisco / ios 15.2(5)e2 15.2(5)e2.x
cisco / ios 15.2(5b)e 15.2(5b)e.x
cisco / ios 15.2(5)ex 15.2(5)ex.x
cisco / ios 15.2(5a)e 15.2(5a)e.x
cisco / ios 15.2(5)e1 15.2(5)e1.x
cisco / ios 15.2(5)e 15.2(5)e.x
cisco / ios_xe 3.9.1e 3.9.1e.x
cisco / ios 15.2(5)e2b 15.2(5)e2b.x
cisco / ios 15.2(5)e2c 15.2(5)e2c.x
cisco / ios_xe 3.9.2e 3.9.2e.x
cisco / ios_xe 16.8.1 16.8.1.x
cisco / ios_xe 16.9.1 16.9.1.x
cisco / ios 12.2(6)i1 12.2(6)i1.x
cisco / ios_xe 3.9.2be 3.9.2be.x
cisco / ios_xe 16.8.1a 16.8.1a.x
cisco / ios_xe 16.8.1s 16.8.1s.x
cisco / ios_xe 16.8.1b 16.8.1b.x
cisco / ios_xe 16.8.2 16.8.2.x
cisco / ios_xe 16.8.1d 16.8.1d.x
cisco / ios_xe 16.8.1c 16.8.1c.x
cisco / ios_xe 16.8.1e 16.8.1e.x
cisco / ios_xe 3.10.0ce 3.10.0ce.x
cisco / ios_xe 3.10.0e 3.10.0e.x
cisco / ios 15.2(6)e1 15.2(6)e1.x
cisco / ios 15.2(6)e 15.2(6)e.x
cisco / ios 15.2(6)e0c 15.2(6)e0c.x
cisco / ios_xe 16.9.1s 16.9.1s.x
cisco / ios_xe 16.9.1c 16.9.1c.x
cisco / ios_xe 16.9.1b 16.9.1b.x
cisco / ios 15.2(6)e0a 15.2(6)e0a.x
cisco / ios_xe 3.10.1e 3.10.1e.x
cisco / ios 15.2(6)e1a 15.2(6)e1a.x
cisco / ios_xe 3.10.1ae 3.10.1ae.x
cisco / ios_xe 3.10.1se 3.10.1se.x
cisco / ios 15.2(6)e1s 15.2(6)e1s.x
cisco / ios_xe 16.9.1d 16.9.1d.x
cisco / ios_xe 3.10.2e 3.10.2e.x
cisco / ios_xe 16.10.1 16.10.1.x
cisco / ios_xe 16.9.1a 16.9.1a.x
cisco / ios_xe 16.9.2a 16.9.2a.x
cisco / ios_xe 16.9.2 16.9.2.x
cisco / ios 15.2(6)e2a 15.2(6)e2a.x
cisco / ios 15.2(6)e2b 15.2(6)e2b.x
cisco / ios 15.2(6)e2 15.2(6)e2.x
cisco / ios_xe 16.12.1 16.12.1.x
cisco / ios_xe 16.11.1 16.11.1.x
cisco / ios_xe 17.1.1 17.1.1.x
cisco / ios 15.2(7)e 15.2(7)e.x
cisco / ios_xe 16.11.1a 16.11.1a.x
cisco / ios_xe 16.12.1c 16.12.1c.x
cisco / ios_xe 16.12.1t 16.12.1t.x
cisco / ios_xe 16.11.2 16.11.2.x
cisco / ios_xe 16.12.1s 16.12.1s.x
cisco / ios_xe 16.12.1a 16.12.1a.x
cisco / ios_xe 16.12.1x 16.12.1x.x
cisco / ios_xe 16.11.1c 16.11.1c.x
cisco / ios_xe 16.11.1b 16.11.1b.x
cisco / ios_xe 16.11.1s 16.11.1s.x
cisco / ios_xe 16.12.1w 16.12.1w.x
cisco / ios_xe 16.10.1s 16.10.1s.x
cisco / ios_xe 16.10.1d 16.10.1d.x
cisco / ios_xe 16.9.2s 16.9.2s.x
cisco / ios_xe 3.11.3e 3.11.3e.x
cisco / ios_xe 3.11.0e 3.11.0e.x
cisco / ios_xe 16.9.3h 16.9.3h.x
cisco / ios_xe 16.9.3a 16.9.3a.x
cisco / ios_xe 16.10.1a 16.10.1a.x
cisco / ios_xe 3.10.3e 3.10.3e.x
cisco / ios_xe 16.10.1f 16.10.1f.x
cisco / ios_xe 16.10.1g 16.10.1g.x
cisco / ios_xe 16.10.2 16.10.2.x
cisco / ios_xe 16.9.3 16.9.3.x
cisco / ios_xe 16.12.1y 16.12.1y.x
cisco / ios_xe 16.10.1e 16.10.1e.x
cisco / ios_xe 16.10.1b 16.10.1b.x
cisco / ios_xe 16.8.3 16.8.3.x
cisco / ios_xe 16.9.3s 16.9.3s.x
cisco / ios_xe 16.10.1c 16.10.1c.x
cisco / ios_xe 16.9.4 16.9.4.x
cisco / ios 15.2(7)e0s 15.2(7)e0s.x
cisco / ios_xe 16.12.2 16.12.2.x
cisco / ios 15.2(7)e0a 15.2(7)e0a.x
cisco / ios 15.2(7a)e0b 15.2(7a)e0b.x
cisco / ios 15.2(7)e1 15.2(7)e1.x
cisco / ios_xe 16.9.4c 16.9.4c.x
cisco / ios_xe 3.11.1e 3.11.1e.x
cisco / ios 15.2(6)e3 15.2(6)e3.x
cisco / ios 15.0(2)se13a 15.0(2)se13a.x
cisco / ios_xe 3.11.1ae 3.11.1ae.x
cisco / ios 15.2(7)e1a 15.2(7)e1a.x
cisco / ios 15.2(7)e0b 15.2(7)e0b.x
cisco / ios 15.1(3)svs 15.1(3)svs.x
cisco / ios_xe 16.12.2a 16.12.2a.x
cisco / ios 15.2(6)eb 15.2(6)eb.x
cisco / ios_xe 16.10.3 16.10.3.x
cisco / ios 15.2(7b)e0b 15.2(7b)e0b.x
cisco / ios_xe 16.9.5 16.9.5.x
cisco / ios_xe 16.9.5f 16.9.5f.x
cisco / ios 15.2(4)ea10 15.2(4)ea10.x
cisco / ios 15.1(3)svr1 15.1(3)svr1.x
cisco / ios 15.3(3)jf13 15.3(3)jf13.x
cisco / ios_xe 16.12.3 16.12.3.x
cisco / ios_xe 17.2.1 17.2.1.x
cisco / ios_xe 17.1.1s 17.1.1s.x
cisco / ios_xe 16.12.2t 16.12.2t.x
cisco / ios_xe 17.1.1a 17.1.1a.x
cisco / ios_xe 16.12.2s 16.12.2s.x
cisco / ios_xe 16.12.3a 16.12.3a.x
cisco / ios_xe 17.1.1t 17.1.1t.x
cisco / ios_xe 17.2.1a 17.2.1a.x
cisco / ios_xe 17.2.1v 17.2.1v.x
cisco / ios_xe 16.12.1z 16.12.1z.x
cisco / ios_xe 16.12.3s 16.12.3s.x
cisco / ios_xe 17.2.1r 17.2.1r.x
cisco / ios_xe 17.1.2 17.1.2.x
cisco / ios_xe 17.2.2 17.2.2.x
cisco / ios_xe 16.12.1za 16.12.1za.x
cisco / ios_xe 17.2.3 17.2.3.x
cisco / ios_xe 16.9.6 16.9.6.x
cisco / ios 15.2(7)e2b 15.2(7)e2b.x
cisco / ios 15.2(7)e2a 15.2(7)e2a.x
cisco / ios_xe 3.11.3ae 3.11.3ae.x
cisco / ios 15.1(3)svr2 15.1(3)svr2.x
cisco / ios 15.1(3)svr3 15.1(3)svr3.x
cisco / ios 15.1(3)svs1 15.1(3)svs1.x
cisco / ios 15.2(7)e3 15.2(7)e3.x
cisco / ios_xe 3.11.2ae 3.11.2ae.x
cisco / ios 15.2(7)e2 15.2(7)e2.x
cisco / ios_xe 3.11.2e 3.11.2e.x
cisco / ios 15.2(7)e3k 15.2(7)e3k.x

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.