CVE-2026-107245
Buffer Overflow in IKE Authentication Leading to Denial of Service on Versa VOS
Published Nov 10, 2026
CVSS 3.1 · 7.5 High
EPSS < 1%
KEV · Not listed
Description
Versa has confirmed a buffer overflow vulnerability in the IPsec implementation on VOS, aka Versa FlexVNF.
Buffer Overflow Vulnerability Description
When a maliciously crafted IKE Auth packet is sent to VOS, the vsmd process crashes, thereby resulting in a Denial of Service. An attacker can create a Denial-of-Service attack on the VOS appliances by crafting a malicious IKE Auth packet and sending it to the WAN interfaces on the VOS.
During the IKE Authentication phase, if the IKE SA negotiation fails, and the size of the Remote ID is larger than the buffer size used to process the Remote ID, it will result in a crash of the vsmd process on the VOS appliance.
What is impacted?
VOS nodes configured with IPsec VPN profiles of type controller-staging-sdwan or remote-access-server using a WAN interface as the IPsec endpoint are vulnerable. (IPsec profiles configured with an overlay interface as the IPsec endpoint are not affected.) This configuration typically applies to all Controllers, Hub Controllers, and SSE Gateways. Additionally, site-to-site VPN profiles configured without a peer IP address, hostname, or FQDN are also vulnerable.
What is not impacted?
The VOS nodes listed above are not vulnerable if they are not accessible from the Internet.
Buffer Overflow Vulnerability Description
When a maliciously crafted IKE Auth packet is sent to VOS, the vsmd process crashes, thereby resulting in a Denial of Service. An attacker can create a Denial-of-Service attack on the VOS appliances by crafting a malicious IKE Auth packet and sending it to the WAN interfaces on the VOS.
During the IKE Authentication phase, if the IKE SA negotiation fails, and the size of the Remote ID is larger than the buffer size used to process the Remote ID, it will result in a crash of the vsmd process on the VOS appliance.
What is impacted?
VOS nodes configured with IPsec VPN profiles of type controller-staging-sdwan or remote-access-server using a WAN interface as the IPsec endpoint are vulnerable. (IPsec profiles configured with an overlay interface as the IPsec endpoint are not affected.) This configuration typically applies to all Controllers, Hub Controllers, and SSE Gateways. Additionally, site-to-site VPN profiles configured without a peer IP address, hostname, or FQDN are also vulnerable.
What is not impacted?
The VOS nodes listed above are not vulnerable if they are not accessible from the Internet.
Affected Products
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CVE record
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NVD configurations
No data
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Red Hat packages
No data
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||
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| Versa | VOS | affected |
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No data.
No data.
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Versa | Vos |
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Remediation
Vendor Workaround
Disable the staging VPN profile on Controllers and Hub Controllers when Zero-Touch Provisioning (ZTP) over the Internet is not actively required. Enable the profile only for the duration of device bootstrapping. For site-to-site IPsec VPN profiles without a configured remote peer, specify the remote peer IP address, hostname, or fully qualified domain name (FQDN). If the source IP address associated with exploitation attempts is known, configure a discard or blackhole route for that IP address to block the malicious traffic.
Tracking
Advisories
Metrics
No CVSS v4.0
Attack Vector Network
Attack Complexity Low
Privileges Required None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
User Interaction None
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.183% probability within 30 days)
Key SSVC decision points have not yet been added.
References
History
Nov 12, 2026 2:30 PM
Scoring metrics updated
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| Metrics |
cvssV3_1
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Nov 10, 2026 10:15 AM
First appearance in the feed. Affected vendors updated
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Versa
Versa vos |
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| Vendors & Products |
Versa
Versa vos |
Nov 10, 2026 9:15 AM
Title updated
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| Type | Values Removed | Values Added |
|---|---|---|
| Title | Buffer Overflow in IKE Authentication Leading to Denial of Service on Versa VOS |
Nov 10, 2026 12:45 AM
Description updated. Weaknesses updated. Added references
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Versa has confirmed a buffer overflow vulnerability in the IPsec implementation on VOS, aka Versa FlexVNF. Buffer Overflow Vulnerability Description When a maliciously crafted IKE Auth packet is sent to VOS, the vsmd process crashes, thereby resulting in a Denial of Service. An attacker can create a Denial-of-Service attack on the VOS appliances by crafting a malicious IKE Auth packet and sending it to the WAN interfaces on the VOS. During the IKE Authentication phase, if the IKE SA negotiation fails, and the size of the Remote ID is larger than the buffer size used to process the Remote ID, it will result in a crash of the vsmd process on the VOS appliance. What is impacted? VOS nodes configured with IPsec VPN profiles of type controller-staging-sdwan or remote-access-server using a WAN interface as the IPsec endpoint are vulnerable. (IPsec profiles configured with an overlay interface as the IPsec endpoint are not affected.) This configuration typically applies to all Controllers, Hub Controllers, and SSE Gateways. Additionally, site-to-site VPN profiles configured without a peer IP address, hostname, or FQDN are also vulnerable. What is not impacted? The VOS nodes listed above are not vulnerable if they are not accessible from the Internet. | |
| Weaknesses | CWE-121 | |
| References |
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Weaknesses
