HOMEVULNERABILITIESCVE-2020-5685
CRITICAL

CVE-2020-5685

CWE-78Published: January 13, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

UNIVERGE SV9500 series from V1 to V7and SV8500 series from S6 to S8 allows an attacker to execute arbitrary OS commands or cause a denial-of-service (DoS) condition by sending a specially crafted request to a specific URL.

NVD Source

Technical Analysis

CVE-2020-5685 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

nec4 product(s)
univerge sv9500 firmwareuniverge sv9500univerge sv8500 firmwareuniverge sv8500
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (4)

→
https://jvn.jp/en/jp/JVN38784555/index.htmlThird Party Advisory
→
https://www.necplatforms.co.jp/en/press/security_adv.htmlVendor Advisory
→
https://jvn.jp/en/jp/JVN38784555/index.htmlThird Party Advisory
→
https://www.necplatforms.co.jp/en/press/security_adv.htmlVendor Advisory

Quick Facts

CVE IDCVE-2020-5685
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-78
CISA KEVNo
Affected1 vendor(s)
PublishedJan 13, 2021

Related CVEs (CWE-78)

CVE-2022-33192
10.0
CVE-2022-33193
10.0
CVE-2021-35402
KEV10.0
CVE-2026-6349
10.0
CVE-2026-46339
10.0
CVE-2022-33194
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-5685 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2020-5685·NVD