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Fencer Vulns
high 7.5

CVE-2021-34805 in the critical feed json

An issue was discovered in FAUST iServer before 9.0.019.019.7.

published 2022-01-31 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21452

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
26.8%
EPSS 26.8% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known, plus a Nuclei check

Summary

An issue was discovered in FAUST iServer before 9.0.019.019.7. For each URL request, it accesses the corresponding .fau file on the operating system without preventing %2e%2e%5c directory traversal.

Patch / fix

  • land-software faust_iserver 9.0.019.019.7

Exploit prediction

26.82% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template FAUST iServer 9.0.018.018.4 - Local File Inclusion nuclei detection template
  • sec-consult.com https://sec-consult.com/vulnerability-lab/ referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/165701/FAUST-iServer-9.0.018.018.4-Local-File-Inclusion.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:C/I:N/A:N

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.