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Fencer Vulns
medium 5.7

CVE-2026-5846 json

Hard-coded Cryptographic Key in Watchfire Controllers

published 2026-07-30 3 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-51313

cvss
5.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

The affected Watchfire Controller Software contains self-signed hard-coded RSA private keys and corresponding X.509 certificates used for authenticating and encrypting HTTPS/TLS connections to the controller's built-in web management interface. These keys are embedded in plaintext within the application patch binaries in the firmware directly from Watchfire's Remote Support filestore.

Patch / fix

  • Watchfire BC550 12.31 SP1
  • Watchfire BC750 11.34, 12.36 SP1
  • Watchfire BC760 12.41 SP1, 14.00 SP1
  • Watchfire BC760DC 12.41 SP1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-26-211-09 updated cvss 5.7

Watchfire Controller Software

  • Watchfire BC550 12.30
    affected: fixed in 12.31, mitigation
  • Watchfire BC750 11.33, 12.35
    affected: fixed in 11.34, mitigation
  • Watchfire BC760 12.38, 13.00 Watchfire BC760DC 12.39
    affected: fixed in 12.41, mitigation

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.7 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
CNA 4.0 7.6 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 4.0 7.6 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • Watchfire BC550
  • Watchfire BC750
  • Watchfire BC760
  • Watchfire BC760DC

Classification

Weakness
  • CWE-321 Use of Hard-coded Cryptographic Key

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.