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

Q: How do I fix CVE-2021-43114?

fort validator: upgrade to 1.5.2; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-43114 being exploited?

CVE-2021-43114 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-43114 affect?

CVE-2021-43114 affects fort validator, debian linux. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2021-43114?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2021-43114 is a high-severity flaw (CVSS 7.5) affecting fort validator, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 33%)
CISA exploited list	No
Published	2021-11-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · fort validator project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-09 13:15 UTCPublished CVE record published
2026-06-17 04:10 UTCUpdated Record last modified

fort validator project fort validator UPGRADE

Affected: < 1.5.2

Fixed in: 1.5.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fort-validator || rpm -q fort-validator || fort-validator --version

2. UPGRADE to 1.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fort-validator

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fort-validator

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-43114?

fort validator: upgrade to 1.5.2; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43114 being exploited?

CVE-2021-43114 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-43114 affect?

CVE-2021-43114 affects fort validator, debian linux. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2021-43114?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2024-56375 HIGH 7.5 DOWNGRADE An integer underflow was discovered in Fort 1.6.3 and 1.6.4 before 1.6.5
CVE-2024-56169 MEDIUM 5.3 UPGRADE A validation integrity issue was discovered in Fort through 1.6.4 before 2.0.0
CVE-2024-45238 HIGH 7.5 UPGRADE An issue was discovered in Fort before 1.6.3
CVE-2024-45235 HIGH 7.5 UPGRADE An issue was discovered in Fort before 1.6.3

References

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