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Servers and applications

CVE-2019-15703

An Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1, 6.2.0, 6.0.8 and below for device not enable hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help of flush+reload side channel attacks in FortiGate VM models only.

Severity
High 7.5
Published
24 Oct 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
6.0.9, 6.2.3
Exploit chance
1% in the next 30 daysHigher than 62% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Fortinet FortiOSServers and applications · cpe:o:fortinet:fortios
  • Every version up to 5.6.9
  • From 6.0.0 before 6.0.9
  • From 6.2.0 before 6.2.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-15703
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-15703