CVE-2026-48131
VPN IKE fragment mishandling may crash the service, causing DoS.
Is CVE-2026-48131 being exploited?
Not confirmed. CVE-2026-48131 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 2.7% probability of exploitation in the next 30 days.
How severe is CVE-2026-48131?
CVE-2026-48131 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-48131?
Not known from our data. No patch reference has been recorded for CVE-2026-48131, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-48131 affect?
CVE-2026-48131 affects VPN services implementing IKE over UDP 500 (and NAT-T 4500). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-48131?
Monitor advisories; apply patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
DoS: unexpected IKE fragment value terminates VPN service, disrupting VPN access.
Monitor only
- affectedR82.10 with Jumbo Hotfix Take 6 or below
- affectedR82 with Jumbo Hotfix Take 91 or below
- affectedR81.20 with Jumbo Hotfix Take 127 or below
- affectedAll releases from R81.10 and below
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.