Zyxel ATP/USG FLEX/VPN/Zywall ID Processing buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.8$5k-$25k0.00

Summaryinfo

A vulnerability classified as critical was found in Zyxel ATP, USG FLEX, VPN and Zywall. Affected by this issue is some unknown functionality of the component ID Processing. The manipulation results in buffer overflow. This vulnerability is cataloged as CVE-2023-33010. The attack may be launched remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability classified as very critical has been found in Zyxel ATP, USG FLEX, VPN and Zywall (Firewall Software) (version unknown). Affected is an unknown function of the component ID Processing. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.25 through 5.36 Patch 1, VPN series firmware versions 4.30 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.25 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 weakness was shared 05/24/2023. The advisory is shared for download at zyxel.com. This vulnerability is traded as CVE-2023-33010 since 05/17/2023. Technical details are unknown but an exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 01/03/2026).

It is declared as attacked. This issue was added on 06/05/2023 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 06/26/2023:

Apply updates per vendor instructions.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-37199). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.8

VulDB Base Score: 9.8
VulDB Temp Score: 9.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector (Zyxel Corporation): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/17/2023 🔍
05/24/2023 +7 days 🔍
05/24/2023 +0 days 🔍
01/03/2026 +955 days 🔍

Sourcesinfo

Vendor: zyxel.com

Advisory: zyxel.com
Status: Confirmed

CVE: CVE-2023-33010 (🔍)
GCVE (CVE): GCVE-0-2023-33010
GCVE (VulDB): GCVE-100-229824
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/24/2023 18:43
Updated: 01/03/2026 12:39
Changes: 05/24/2023 18:43 (47), 06/17/2023 08:19 (1), 04/28/2024 19:50 (26), 09/09/2024 22:30 (2), 01/27/2025 23:42 (9), 01/03/2026 12:39 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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