CVE-2023-33009
Zyxel Multiple Firewalls: Buffer Overflow
As of , CVE-2023-33009 in Zyxel Multiple Firewalls is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.
- Exploited
- Yes: CISA listed it on 5 June 2023
- US federal deadline
- 26 June 202321 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.28Higher than 98% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- 0.00 on 5 June 2023EPSS on the day CISA listed it.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: www.zyxel.comLinks below, from CISA's entry.
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.
CISA's description
A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.60 through 5.36 Patch 1, VPN series firmware versions 4.60 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.60 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.
The CVE record's description, from Zyxel
- CVE published
- 24 May 2023
- Assigned by
- Zyxel
- CVSS
- 9.8 Critical (CVSS 3.1, from the CNA)
- CWE-120
- Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Multiple Firewalls: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2023-28771OS Command Injection | Zyxel Multiple Firewalls | Patch this weekMetasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2022-30525OS Command Injection | Zyxel Multiple Firewalls | Patch this weekMetasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2024-11667Path Traversal | Zyxel Multiple Firewalls | Patch this weekRansomware use | 0.03 | ||
| CVE-2023-33010Buffer Overflow | Zyxel Multiple Firewalls | Patch soon | 0.29 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org