Security Management and SmartConsole
CVE-2026-91843: Stack overflow in login process to the Security Management and Log Servers
A stack overflow during the unauthenticated login process may allow an attacker to run arbitrary code remotely with root privileges.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityCRITICALCVSS 3.1 9.8
EPSS0.52%Chance of exploitation in 30 days
Public exploitNot tracked
FixNot yet
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Quantum Security Management R82.10 with Jumbo Hotfix Take 44 or below | See the advisory |
| Quantum Security Management R82 with Jumbo Hotfix Take 126 or below | See the advisory |
| Quantum Security Management R81.20 with Jumbo Hotfix Take 166 or below | See the advisory |
| Quantum Security Management R81.10 (EOS) with Jumbo Hotfix Take 190 or below | See the advisory |
| Quantum Security Management R81 (EOS) | See the advisory |
| Quantum Security Management R80.40 (EOS) | See the advisory |
| Quantum Security Management R80.30 (EOS) | See the advisory |
| Quantum Security Management R80.20 (EOS) | See the advisory |
| Quantum Security Management R80.10 (EOS) | See the advisory |
| Quantum Security Management R80 (EOS) | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A stack overflow during the unauthenticated login process may allow an attacker to run arbitrary code remotely with root privileges.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.