TI-2024-37332 Aliases CVE-2024-56375 GHSA-533g-7w58-g89m

Integer underflow in NICMx fort-validator

LOW 39CWE-191Published 2024-12-22 · Updated 2025-01-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-191 and the CVSS impact.

Summary

An integer underflow was discovered in Fort 1.6.3 and 1.6.4 before 1.6.5. A malicious RPKI repository that descends from a (trusted) Trust Anchor can serve (via rsync or RRDP) a Manifest RPKI object containing an empty fileList. Fort dereferences (and, shortly afterwards, writes to) this array during a shuffle attempt, before the validation that would normally reject it when empty. This out-of-bounds access is caused by an integer underflow that causes the surrounding loop to iterate infinitely. Because the product is permanently stuck attempting to overshuffle an array that doesn't actually exist, a crash is nearly guaranteed.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0047 40th percentileScored 2026-11-07

Fix Fixed fort-validator (nicmx): 1.6.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
NICMx	fort-validator	1.6.3 to before 1.6.5	1.6.5	Patch available	CNA

fort-validator VendorNICMx Affected 1.6.3 to before 1.6.5 Fixed in 1.6.5 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:nicmx:fort_validator:1.6.3:::::::*	1.6.3	Vulnerable	NICMx
cpe:2.3:a:nicmx:fort_validator:1.6.4:::::::*	1.6.4	Vulnerable	NICMx

cpe:2.3:a:nicmx:fort_validator:1.6.3:*:*:*:*:*:*:* Versions 1.6.3 Vulnerable ·NICMx
cpe:2.3:a:nicmx:fort_validator:1.6.4:*:*:*:*:*:*:* Versions 1.6.4 Vulnerable ·NICMx

Remediation

Fix · CNA fort-validator (nicmx) Fixed in 1.6.5

Timeline

2026-10-02 Threatist record created from CVE-2024-56375
2026-10-03 Alias added: GHSA-533g-7w58-g89m

References

Advisory 2

TI-2024-30315 An issue was discovered in Fort before 1.6.3. CVSS 3.1HIGH 7.5
TI-2024-30312 An issue was discovered in Fort before 1.6.3. CVSS 3.1HIGH 7.5
TI-2024-37144 A validation integrity issue was discovered in Fort through 1.6.4 before 2.0.0. CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences