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Known exploited vulnerability

CVE-2023-27992

criticalCVSS 3.1 9.8In CISA KEVEPSS 82%Published · Zyxel

The short answer

CVE-2023-27992 affects Zyxel NAS326 firmware and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-06-23: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versions prior to V5.21(AATB.11)C0, and NAS542 firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.

Weakness: CWE-78.

Severity

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Jun 23, 2023

Federal due date Jul 14, 2023

EPSS, next 30 days

82%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply updates per vendor instructions.

Affected products

NAS326 firmware, NAS540 firmware, NAS542 firmware. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2023-27992 being exploited?

Yes. CISA added CVE-2023-27992 to its Known Exploited Vulnerabilities catalog on 2023-06-23, with a federal remediation due date of 2023-07-14.

How do I fix CVE-2023-27992?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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