CVE-2021-43114Network attack vector

Denial of service via EE certificate crash

Published Nov 9, 2021 · Updated Oct 15, 2024

FORT Validator before 1.5.2 allows remote attackers to crash the validator by supplying an RPKI CA publication containing an X.509 EE certificate. Certificate-stack processing mishandles the EE certificate and enters a crash path while building validation state. No authentication is required; the process failure removes RPKI VRP data from RTR clients such as BGP routers and disables Route Origin Validation until recovery.

CVSS severity7.5
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

FORT Validator before 1.5.2 allows remote attackers to crash the validator by supplying an RPKI CA publication containing an X.509 EE certificate. Certificate-stack processing mishandles the EE certificate and enters a crash path while building validation state. No authentication is required; the process failure removes RPKI VRP data from RTR clients such as BGP routers and disables Route Origin Validation until recovery.

The record

CVE
CVE-2021-43114
Published
Nov 9, 2021
Updated
Oct 15, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, CWE-295, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-400Uncontrolled Resource Consumption
CWE-295Improper Certificate Validation
T1499.002Network Denial of Service

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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