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CVE-2026-86107

Security Advisory 0180

MEDIUM
5.9
CVSS Score
Published: September 16, 2026 at 10:49 AM UTC
Updated: September 16, 2026 at 07:24 PM UTC
2 products affected across 1 vendorVeloCloudVeloCloud Gateway

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

The VeloCloud Edge and Gateway exhibit an out-of-bounds write vulnerability when processing tunneled IP fragments between authenticated overlay neighbors. This vulnerability impacts the VeloCloud VCMP tunnel protocol only. A successful exploit can cause the affected process to terminate and restart, leading to a temporary disruption of traffic. Hosts on the internet that are unauthenticated and unable to form an overlay peer relationship can not trigger the vulnerable logic.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

VeloCloud· Arista Networks
60%
1.0.0.0 ≤ v < 5.2.0.05.2.0.0 ≤ v < 5.2.7.06.1.0.0 ≤ v < 6.1.5.06.4.0.0 ≤ v < 6.4.2.01.0.0.05.2.0.06.1.0.06.4.0.0
Affected range stops below 5.2.0.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.7.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.5.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.2.0, so it looks safe — our inference, not a vendor statement
VeloCloud Gateway· Arista Networks
60%
1.0.0.0 ≤ v < 5.2.0.05.2.0.0 ≤ v < 5.2.7.06.1.0.0 ≤ v < 6.1.5.06.4.0.0 ≤ v < 6.4.2.01.0.0.05.2.0.06.1.0.06.4.0.0
Affected range stops below 5.2.0.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.7.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.5.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.arista.com/en/support/advisories-notices/security-advisory/24736-security-advisory-0180

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMArista
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-787

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