CVE-2021-1424

mediumpriority · track · 0EPSS 0.008 · 57 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.81% (57th) EPSS

CVSS 5.3 · medium

Is it mine?

224 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco ASR 5000 Series Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/RL:X/RC:X/E:Xsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · psirt@cisco.com USexploitability 3.9 · impact 1.4

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USCWE-119US

affected products (224)

Products and version ranges known to be affected.

Cisco Cisco ASR 5000 Series Softwareall versionscisco_csafUS
Cisco Cisco ASR 5000 Series Software≤ 21.15.10enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.14.5enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.12.10enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.13.0enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.15.33enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.16.c11enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.15.36enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.19.0enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.14.10enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.18.0enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.14.23enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.15.41enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.15.53enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.11.16enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.19.4enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.12.3enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.17.3enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.20.SV1enisa_euvdEU
Cisco Cisco ASR 5000 Series Software≤ 21.13.20enisa_euvdEU

showing 20 of 224

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-staros-ipsecmgr-dos-3gkHXwvSCisco ASR 5000 Series Software (StarOS) ipsecmgr Process Denial of Service Vulnerability2021-03-03csaf · cisco_csafUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf NVD CVE.org MITRE

published 2024-11-18modified 2026-06-17

references (13)

External citations — patches, advisories, analysis.

scry

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