Improper authentication in NEC Corporation UNIVERGE SV9500/SV8500 series
Priority LOW 35CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.
Summary
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.
Why it matters now
EPSS 0.01178 67th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| NEC Corporation | UNIVERGE SV9500/SV8500 series | SV9500 series from V1 to V7and SV8500 series from S6 to S8 | — | No fix listed | CNA |
- UNIVERGE SV9500/SV8500 series VendorNEC Corporation Affected SV9500 series from V1 to V7and SV8500 series from S6 to S8 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:nec:univerge_sv9500_firmware:*:*:*:*:*:*:*:* | v1 – v7 | Vulnerable | NEC Corporation |
| cpe:2.3:h:nec:univerge_sv9500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NEC Corporation |
| cpe:2.3:o:nec:univerge_sv8500_firmware:*:*:*:*:*:*:*:* | s6 – s8 | Vulnerable | NEC Corporation |
| cpe:2.3:h:nec:univerge_sv8500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NEC Corporation |
- cpe:2.3:o:nec:univerge_sv9500_firmware:*:*:*:*:*:*:*:* Versions v1 – v7 Vulnerable ·NEC Corporation
- cpe:2.3:h:nec:univerge_sv9500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NEC Corporation
- cpe:2.3:o:nec:univerge_sv8500_firmware:*:*:*:*:*:*:*:* Versions s6 – s8 Vulnerable ·NEC Corporation
- cpe:2.3:h:nec:univerge_sv8500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NEC Corporation
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-5686
- 2026-10-03 Alias added: GHSA-gq7j-hx55-h62p
References
More NEC Corporation Univerge Sv8500 Firmware vulnerabilities
- TI-2020-04646 OS command injection in NEC Corporation UNIVERGE SV9500/SV8500 series CVSS 3.1CRITICAL 9.8
Sources
- CVE-2020-5686 · CVE Program
- CVE-2020-5686 · NVD
- FIRST EPSS
- GHSA-gq7j-hx55-h62p · GitHub Advisory Database · CC BY 4.0
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