Quantum Security Gateway
CVE-2026-48131: VPND IKE Fragment Reassembly - Heap Out-of-Bounds Write via Sequence Number Zero
The VPN service may mishandle an unexpected IKE fragment value received on the IKE port 500/UDP during the early stage of a connection attempt.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 3.1 8.1
EPSS0.40%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 Gateway R82.10 with Jumbo Hotfix Take 6 or below | See the advisory |
| Quantum Security Gateway R82 with Jumbo Hotfix Take 91 or below | See the advisory |
| Quantum Security Gateway R81.20 with Jumbo Hotfix Take 127 or below | See the advisory |
| Quantum Security Gateway All releases from R81.10 and below | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
The VPN service may mishandle an unexpected IKE fragment value received on the IKE port 500/UDP during the early stage of a connection attempt. This can cause the service to terminate unexpectedly, resulting in denial of service (temporary disruption of VPN-related functionality).
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.