8 High
CVSS3
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7 High
CVSS2
Access Vector
ADJACENT_NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:A/AC:L/Au:S/C:C/I:C/A:C
Zyxel has moved to address a critical security vulnerability affecting Zyxel firewall devices that enables unauthenticated and remote attackers to gain arbitrary code execution.
“A command injection vulnerability in the CGI program of some firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device,” the company said in an advisory published Thursday.
Cybersecurity firm Rapid7, which discovered and reported the flaw on April 13, 2022, said that the weakness could permit a remote unauthenticated adversary to execute code as the “nobody” user on impacted appliances.
Tracked as CVE-2022-30525 (CVSS score: 9.8), the flaw impacts the following products, with patches released in version ZLD V5.30 -
Rapid 7 noted that there are at least 16,213 vulnerable Zyxel devices exposed to the internet, making it a lucrative attack vector for threat actors to stage potential exploitation attempts.
The cybersecurity firm also pointed out that Zyxel silently issued fixes to address the issue on April 28, 2022 without publishing an associated Common Vulnerabilities and Exposures (CVE) identifier or a security advisory. Zyxel, in its alert, blamed this on a “miscommunication during the disclosure coordination process.”
“Silent vulnerability patching tends to only help active attackers, and leaves defenders in the dark about the true risk of newly discovered issues,” Rapid7 researcher Jake Baines said.
The advisory comes as Zyxel addressed three different issues, including a command injection (CVE-2022-26413), a buffer overflow (CVE-2022-26414), and a local privilege escalation (CVE-2022-0556) flaw, in its VMG3312-T20A wireless router and AP Configurator that could lead to arbitrary code execution.
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8 High
CVSS3
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7 High
CVSS2
Access Vector
ADJACENT_NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:A/AC:L/Au:S/C:C/I:C/A:C