CVE-2020-6760: Schmid ZI 620 V400 VPN 090 routers allow an attacker to execute OS commands as root via shell metacharacters t

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2020-6760 is a critical-severity flaw (CVSS 9.8) affecting zi 620 v400 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Schmid ZI 620 V400 VPN 090 routers allow an attacker to execute OS commands as root via shell metacharacters to an entry on the SSH subcommand menu, as demonstrated by ping.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-78
Published	2020-02-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: schmid-telecom

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-02-06 21:15 UTCPublished CVE record published
2026-06-17 03:23 UTCUpdated Record last modified

schmid-telecom zi 620 v400 firmware MITIGATE

Affected: 090

Fixed in: no fixed release known

Safe to downgrade to: a release before 090

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-6760?

zi 620 v400 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-6760 being exploited?

CVE-2020-6760 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-6760 affect?

CVE-2020-6760 affects zi 620 v400 firmware. Severity is critical (CVSS 9.8). Schmid ZI 620 V400 VPN 090 routers allow an attacker to execute OS commands as root via shell metacharacters to an entry on the SSH subcommand menu, as demonstrated by ping.

How urgent is CVE-2020-6760?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs