© 2026 vulntracker.io

CVE-2021-1424

Cisco ASR 5000 Series Software (StarOS) ipsecmgr Process Denial of Service Vulnerability

MEDIUM

5.3

CVSS Score

Published: November 18, 2024 at 03:35 PM UTC

Updated: June 17, 2026 at 03:31 AM UTC

2 products affected across 1 vendorAsr 5000 Series SoftwareStaros

Using Cisco ASR 5000 Series Software by Cisco?

Get instant alerts when new vulnerabilities affect Cisco ASR 5000 Series Software - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.3

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

Description

A vulnerability in the ipsecmgr process of Cisco ASR 5000 Series Software (StarOS) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to insufficient validation of incoming Internet Key Exchange Version 2 (IKEv2) packets. An attacker could exploit this vulnerability by sending specifically malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to cause the ipsecmgr process to restart, which would disrupt ongoing IKE negotiations and result in a temporary DoS condition.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Asr 5000 Series Software · Cisco

95%

21.11.0 21.11.1 21.11.10 21.11.11 21.11.12 21.11.13 21.11.14 21.11.15 21.11.16 21.11.17 21.11.18 21.11.19 21.11.2 21.11.3 21.11.4 21.11.5 21.11.6 21.11.7 21.11.8 21.11.9 21.12.0 21.12.1 21.12.10 21.12.11 21.12.12 21.12.13 21.12.14 21.12.16 21.12.17 21.12.18 21.12.19 21.12.2 21.12.20 21.12.21 21.12.3 21.12.4 21.12.5 21.12.6 21.12.7 21.12.8 21.12.9 21.13.0 21.13.1 21.13.10 21.13.11 21.13.12 21.13.13 21.13.14 21.13.15 21.13.16 21.13.17 21.13.18 21.13.19 21.13.2 21.13.20 21.13.21 21.13.3 21.13.4 21.13.5 21.13.6 21.13.7 21.13.8 21.13.9 21.14.0 21.14.1 21.14.10 21.14.11 21.14.12 21.14.16 21.14.17 21.14.19 21.14.2 21.14.20 21.14.22 21.14.23 21.14.3 21.14.4 21.14.5 21.14.6 21.14.7 21.14.8 21.14.9 21.14.a0 21.14.b12 21.14.b13 21.14.b14 21.14.b15 21.14.b17 21.14.b18 21.14.b19 21.14.b20 21.14.b21 21.14.b22 21.15.0 21.15.1 21.15.10 21.15.11 21.15.12 21.15.13 21.15.14 21.15.15 21.15.16 21.15.17 21.15.18 21.15.19 21.15.2 21.15.20 21.15.21 21.15.22 21.15.24 21.15.25 21.15.26 21.15.27 21.15.28 21.15.29 21.15.3 21.15.30 21.15.32 21.15.33 21.15.36 21.15.37 21.15.4 21.15.40 21.15.41 21.15.43 21.15.45 21.15.46 21.15.47 21.15.48 21.15.5 21.15.51 21.15.52 21.15.53 21.15.54 21.15.55 21.15.6 21.15.7 21.15.8 21.16.2 21.16.3 21.16.4 21.16.5 21.16.6 21.16.7 21.16.8 21.16.c10 21.16.c11 21.16.c12 21.16.c13 21.16.c14 21.16.c15 21.16.c9 21.16.d0 21.16.d1 21.17.0 21.17.1 21.17.10 21.17.11 21.17.12 21.17.13 21.17.14 21.17.15 21.17.16 21.17.17 21.17.2 21.17.3 21.17.4 21.17.5 21.17.6 21.17.7 21.17.8 21.17.9 21.18.0 21.18.1 21.18.11 21.18.12 21.18.13 21.18.14 21.18.15 21.18.2 21.18.3 21.18.4 21.18.5 21.18.6 21.18.7 21.18.8 21.18.9 21.19.0 21.19.1 21.19.10 21.19.2 21.19.3 21.19.4 21.19.5 21.19.6 21.19.7 21.19.8 21.19.9 21.19.n3 21.19.n4 21.19.n5 21.19.n6 21.20.0 21.20.1 21.20.10 21.20.11 21.20.2 21.20.3 21.20.4 21.20.6 21.20.7 21.20.8 21.20.9 21.20.k6 21.20.k7 21.20.sv1 21.20.sv2 21.20.sv3 21.20.sv5 21.20.u8 21.21.0 21.21.1

Staros · Cisco

60%

21.11.0 21.11.1 21.11.10 21.11.11 21.11.12 21.11.13 21.11.14 21.11.15 21.11.16 21.11.17 21.11.18 21.11.19 21.11.2 21.11.3 21.11.4 21.11.5 21.11.6 21.11.7 21.11.8 21.11.9 21.12.0 21.12.1 21.12.10 21.12.11 21.12.12 21.12.13 21.12.14 21.12.16 21.12.17 21.12.18 21.12.19 21.12.2 21.12.20 21.12.21 21.12.3 21.12.4 21.12.5 21.12.6 21.12.7 21.12.8 21.12.9 21.13.0 21.13.1 21.13.10 21.13.11 21.13.12 21.13.13 21.13.14 21.13.15 21.13.16 21.13.17 21.13.18 21.13.19 21.13.2 21.13.20 21.13.21 21.13.3 21.13.4 21.13.5 21.13.6 21.13.7 21.13.8 21.13.9 21.14.0 21.14.1 21.14.10 21.14.11 21.14.12 21.14.16 21.14.17 21.14.19 21.14.2 21.14.20 21.14.22 21.14.23 21.14.3 21.14.4 21.14.5 21.14.6 21.14.7 21.14.8 21.14.9 21.14.a0 21.14.b12 21.14.b13 21.14.b14 21.14.b15 21.14.b17 21.14.b18 21.14.b19 21.14.b20 21.14.b21 21.14.b22 21.15.0 21.15.1 21.15.10 21.15.11 21.15.12 21.15.13 21.15.14 21.15.15 21.15.16 21.15.17 21.15.18 21.15.19 21.15.2 21.15.20 21.15.21 21.15.22 21.15.24 21.15.25 21.15.26 21.15.27 21.15.28 21.15.29 21.15.3 21.15.30 21.15.32 21.15.33 21.15.36 21.15.37 21.15.4 21.15.40 21.15.41 21.15.43 21.15.45 21.15.46 21.15.47 21.15.48 21.15.5 21.15.51 21.15.52 21.15.53 21.15.54 21.15.55 21.15.6 21.15.7 21.15.8 21.16.2 21.16.3 21.16.4 21.16.5 21.16.6 21.16.7 21.16.8 21.16.c10 21.16.c11 21.16.c12 21.16.c13 21.16.c14 21.16.c15 21.16.c9 21.16.d0 21.16.d1 21.17.0 21.17.1 21.17.10 21.17.11 21.17.12 21.17.13 21.17.14 21.17.15 21.17.16 21.17.17 21.17.2 21.17.3 21.17.4 21.17.5 21.17.6 21.17.7 21.17.8 21.17.9 21.18.0 21.18.1 21.18.11 21.18.12 21.18.13 21.18.14 21.18.15 21.18.2 21.18.3 21.18.4 21.18.5 21.18.6 21.18.7 21.18.8 21.18.9 21.19.0 21.19.1 21.19.10 21.19.2 21.19.3 21.19.4 21.19.5 21.19.6 21.19.7 21.19.8 21.19.9 21.19.n3 21.19.n4 21.19.n5 21.19.n6 21.20.0 21.20.1 21.20.10 21.20.11 21.20.2 21.20.3 21.20.4 21.20.6 21.20.7 21.20.8 21.20.9 21.20.SV1 21.20.SV2 21.20.SV3 21.20.SV5 21.20.k6 21.20.k7 21.20.u8 21.21.0 21.21.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-sma-info-disclo-VOu2GHbZ

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-sigverbypass-gPYXd6Mk

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-staros-ipsecmgr-dos-3gkHXwvS

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrbgp-rpki-dos-gvmjqxbk

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMcisco

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: LOW

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-119

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card