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CVE Record

CVE-2021-43114: FORT Validator versions prior to 1.5.2 will crash if an RPKI CA publishes an X.509 EE certificate.

FORT Validator versions prior to 1.5.2 will crash if an RPKI CA publishes an X.509 EE certificate. This will lead to RTR clients such as BGP routers to lose access to the RPKI VRP data set, effectively disabling Route Origin Validation.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

FORT Validator is part of the RPKI trust chain used to help routers reject invalid route origins. Versions before 1.5.2 can crash when an RPKI CA publishes an X.509 EE certificate, causing routers to lose VRP data and effectively disabling Route Origin Validation.

Executive priority

Treat as high priority for networks relying on RPKI Route Origin Validation. The issue does not indicate data theft, but it can remove a key routing security control and increase exposure to invalid route announcements until fixed.

Technical view

CVE-2021-43114 is a network-reachable availability issue in FORT Validator before 1.5.2. The failure condition is processing an X.509 EE certificate published by an RPKI CA. The documented impact is validator crash, loss of RTR VRP availability to BGP routers, and degraded ROV enforcement.

Likely exposure

Exposure is limited to organizations running FORT Validator versions earlier than 1.5.2, especially where BGP routers use it as an RTR source for RPKI VRP data.

Exploitation context

The provided bundle does not show CISA KEV listing or cited evidence of active exploitation. The security concern is operational disruption: a crash in the validator can remove RPKI validation data from dependent routers.

Researcher notes

Affected CPE metadata is incomplete in the bundle, but the version boundary is clear: FORT Validator before 1.5.2. Public references include the 1.5.2 release, Debian DSA-5033, and multiple upstream commits associated with the fix.

Mitigation direction

  • Upgrade FORT Validator to version 1.5.2 or later.
  • Apply Debian DSA-5033 updates where FORT Validator is installed from Debian packages.
  • Check vendor release notes and downstream advisories for environment-specific guidance.
  • Ensure routers have resilient RTR configuration where operationally possible.

Validation and detection

  • Inventory all FORT Validator deployments and confirm installed versions.
  • Identify BGP routers that depend on each validator for RTR VRP data.
  • Review validator logs for crashes or restarts during RPKI repository processing.
  • Confirm RTR clients continue receiving VRP data after validator syncs.
  • Verify Route Origin Validation remains enabled on dependent routers.
Prepared
Confidence
high
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2021-43114 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2021-43114Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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