CVE-2023-34139
📛 CVE Title
CVE-2023-34139
Description
A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- Zyxel
- CVSS severity
- HIGH
- CVSS score
- 8.8 / 10
- CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Effective score
- 8.8 / 10 HIGH source: CNA overview
- CWE(s)
-
CWE-78 - Reserved
- 2023-05-26
- Published
- 2023-07-17 19:36 UTC
- Last updated
- 2024-10-29 17:19 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2023/34xxx/CVE-2023-34139.json
- Linked Threat
- CVE-2023-34139 — CVE-2023-34139
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2023-07-17 18:15:09 UTC
- NVD last modified
- 2026-06-17 06:02:58 UTC
- NVD CVSS v3.1
- 8.8 / 10 HIGH source: security@zyxel.com.tw
- NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Exploitability subscore
- 2.8 / 10
- Impact subscore
- 5.9 / 10
- EPSS score
- 0.0069 (probability of exploitation in next 30 days)
- EPSS percentile
- 48.29% vs all CVEs — higher = more likely to be exploited, as of 2026-07-01
NVD / KEV / EPSS data refreshed 2026-07-01 14:15 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2023-38241 - Assigner
- Zyxel
- Published
- Jul 17, 2023, 5:36:32 PM
- Updated
- Oct 29, 2024, 4:19:03 PM
- EUVD base score (CVSS 3.1)
-
8.8 / 10
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EUVD-reported EPSS
- 0.1900
- Vendors
- Zyxel
- Products
-
VPN series Firmware (4.20 through 5.36 Patch 2)VPN series Firmware (4.20 through 5.36 Patch 2)USG FLEX series firmware (4.50 through 5.36 Patch 2)
- Aliases
-
GHSA-xjxm-x67w-v3c7
ENISA description: A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Zyxel | USG FLEX series firmware |
4.50 through 5.36 Patch 2 (affected)
|
— |
| Zyxel | VPN series firmware |
4.20 through 5.36 Patch 2 (affected)
|
— |
Affected products — CPE 2.3 (30) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:o:zyxel:usg_2200-vpn_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_2200-vpn:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_flex_50:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_flex_50w:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:zywall_vpn100:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:zywall_vpn2s_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:zywall_vpn2s:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:zywall_vpn300:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:zywall_vpn50_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:zywall_vpn50:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:zywall_vpn_100_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:zywall_vpn_100:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:zywall_vpn_300_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:zywall_vpn_300:-:*:*:*:*:*:*:*cpe:2.3:o:zyxel:zywall_vpn_50_firmware:*:*:*:*:*:*:*:*cpe:2.3:h:zyxel:zywall_vpn_50:-:*:*:*:*:*:*:*
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
MITRE references (1) cveawg.mitre.org
Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.
Web references (0)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
No web references attached yet.
NVD-tagged references (2)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers security@zyxel.com.tw Vendor Advisory
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers af854a3a-2127-422b-91ae-364da2661108 Vendor Advisory
Remediations (16)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:github.com
NOTE: NVMeFix supports up to macOS 26, some features might not be available on newer versions as of now, like the timeout panic fix . NVMeFix is a set of patches for the Apple NVMe storage driver, IONVMeFamily. Its goal is to improve compatibility with non-Apple SSDs. It may be used both on Apple and non-Apple computers. The following features are implemented: Autonomous Power State Transition ...
2026-06-15 21:11 UTC -
web:www.anavem.com
KB5094139 — Security Update for Microsoft Exchange Server Subscription Edition KB5094139 is a security update that addresses multiple vulnerabilities in Microsoft Exchange Server Subscription Edition RTM, including remote code execution and elevation of privilege flaws affecting mail flow and web services.
2026-06-15 21:11 UTC -
web:www.microsoft.com
Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.
2026-06-15 21:11 UTC -
web:nvd.nist.gov
The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...
2026-06-15 21:11 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-06-15 21:11 UTC -
web:github.com
CVEfixes: Automated Collection of Vulnerabilities and Their Fixes from Open-Source Software - secureIT-project/CVEfixes
2026-06-15 21:11 UTC -
web:translate.google.com
Google's service, offered free of charge, instantly translates words, phrases, and web pages between English and over 100 other languages.
2026-05-22 06:39 UTC -
web:web.whatsapp.com
Log in to WhatsApp Web for simple, reliable and private messaging on your desktop. Send and receive messages and files with ease, all for free.
2026-05-22 06:39 UTC -
web:www.oracle.com
Critical Security Patch Updates Critical Security Patch Updates provide security patches for supported Oracle on-premises products. A Critical Security Patch Update provides targeted, high-priority security fixes in a smaller, more focused format, making them easier to apply with minimal disruption.
2026-05-22 06:39 UTC -
web:access.redhat.com
Learn about our open source products, services, and company. You are here
2026-05-22 06:39 UTC -
web:www.tenable.com
What is patch management? At its core, patch management is the formal process your organization uses to identify, acquire, test, and deploy software updates, or "patches," to your IT assets. Vendors release patches for several reasons: Fix software bugs Improve performance Add new features Fix vulnerabilities that attackers could otherwise exploit A patch can be a minor, single fix (a "hotfix ...
2026-05-22 06:39 UTC -
web:cybersecuritynews.com
Google released a critical Chrome update fixing multiple high-risk vulnerabilities that could enable arbitrary code execution.
2026-05-22 06:39 UTC -
web:github.com
A new and improved community patch for BO3. . Contribute to shiversoftdev/t7patch development by creating an account on GitHub.
2026-05-22 06:39 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-22 06:39 UTC -
web:source.android.com
This Section contains the available Android Security Bulletins, which provide fixes for possible issues affecting Android devices.
2026-05-22 06:39 UTC -
web:support.servicenow.com
Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...
2026-05-22 06:39 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2023-34139.json.
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