CVE-2021-43268Network attack vector

Service interruption via malformed IKE packet

Published Nov 24, 2021 · Updated Aug 4, 2024

Memory-safety flaws in the IKE component of Wind River VxWorks 6.9 through 7 allow remote attackers to interrupt service with a crafted packet. The IKE packet-processing path reads beyond a buffer's end or releases the same allocation twice when it handles the malformed input; the responsible routine and field are undisclosed. An unauthenticated network path to the IKE service is required, and public records establish service disruption but not whether the outcome is a crash or another interruption.

CVSS severity6.5
Medium
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-safety flaws in the IKE component of Wind River VxWorks 6.9 through 7 allow remote attackers to interrupt service with a crafted packet. The IKE packet-processing path reads beyond a buffer's end or releases the same allocation twice when it handles the malformed input; the responsible routine and field are undisclosed. An unauthenticated network path to the IKE service is required, and public records establish service disruption but not whether the outcome is a crash or another interruption.

The record

CVE
CVE-2021-43268
Published
Nov 24, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
6.4NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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