CVE-2020-5685

Unauthenticated command execution via crafted TSMM request

Published Jan 13, 2021 · Updated Aug 4, 2024

OS command injection in NEC UNIVERGE SV9500 V1 through V7 and SV8500 S6 through S8 allows remote attackers to execute commands or interrupt service. The TSMM web maintenance console fails to neutralize command elements in a specially crafted request before invoking an operating-system command. Access to the TSMM interface is required; exploitation permits arbitrary command execution or a service interruption, while NEC has not disclosed the affected URL or parameter.

CVSS severity9.6
Critical
EPSS probability1.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in NEC UNIVERGE SV9500 V1 through V7 and SV8500 S6 through S8 allows remote attackers to execute commands or interrupt service. The TSMM web maintenance console fails to neutralize command elements in a specially crafted request before invoking an operating-system command. Access to the TSMM interface is required; exploitation permits arbitrary command execution or a service interruption, while NEC has not disclosed the affected URL or parameter.

The record

CVE
CVE-2020-5685
Published
Jan 13, 2021
Updated
Aug 4, 2024
Vendor
NEC Corporation
Product
UNIVERGE SV9500/SV8500 series
Classifications
CWE-78, T1059
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=SV9500 series from V1 to V7and SV8500 series from S6 to S8

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

NEC Corporation · UNIVERGE SV9500/SV8500 seriesversion=SV9500 series from V1 to V7and SV8500 series from S6 to S8

Published CVSS scores

5.8JPCERT/CC and IPAAV:A/AC:L/Au:N/C:P/I:P/A:P
9.6JPCERT/CC and IPACVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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