What’s Vulnerable › Vulnerabilities

CVE-2021-36762

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-19 · updated 2026-06-17

Description

An issue was discovered in HCC Embedded InterNiche NicheStack through 4.3. The tfshnd():tftpsrv.c TFTP packet processing function doesn't ensure that a filename is adequately '\0' terminated; therefore, a subsequent call to strlen for the filename might read out of bounds of the protocol packet buffer (if no '\0' byte exists within a reasonable range).

Affected products

• Hcc-Embedded Nichestack: before 4.3 — fixed in 4.3

How to fix

Upgrade to a fixed version: Hcc-Embedded Nichestack 4.3. Check the vendor advisory for mitigations.

References

• https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/
• https://www.hcc-embedded.com/about/about-interniche
• https://www.kb.cert.org/vuls/id/608209
• https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/
• https://www.hcc-embedded.com/about/about-interniche
• https://www.kb.cert.org/vuls/id/608209

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