What is the CVSS score of CVE-2022-26376?

CVE-2022-26376 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.1%.

Is there a public PoC exploit available for CVE-2022-26376?

Yes, a public proof-of-concept exploit is available for CVE-2022-26376. Prioritise patching immediately. EPSS: 1.1%.

Asuswrt Merlin CVE-2022-26376

CRITICAL

Out-of-bounds Write (CWE-787)

2022-08-05 talos-cna@cisco.com

Buffer Overflow Memory Corruption Asuswrt Merlin Gt Ax11000 Firmware Rt Ax55 Firmware Rt Ax56U Firmware Rt Ax58U Firmware Rt Ax82U Firmware Rt Ax86U Firmware Rt Ax68U Firmware Asuswrt New Gen Xt8 Firmware Tuf Ax3000 V2 Firmware Xd4 Firmware Et12 Firmware Gt Ax6000 Firmware Xt12 Firmware Xt9 Firmware Xd6 Firmware Gt Ax11000 Pro Firmware Gt Axe16000 Firmware Asus

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Aug 05, 2022 - 22:15 nvd

CRITICAL 9.8

DescriptionNVD

A memory corruption vulnerability exists in the httpd unescape functionality of Asuswrt prior to 3.0.0.4.386_48706 and Asuswrt-Merlin New Gen prior to 386.7.. A specially-crafted HTTP request can lead to memory corruption. An attacker can send a network request to trigger this vulnerability.

AnalysisAI

A memory corruption vulnerability exists in the httpd unescape functionality of Asuswrt prior to 3.0.0.4.386_48706 and Asuswrt-Merlin New Gen prior to 386.7.. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. A memory corruption vulnerability exists in the httpd unescape functionality of Asuswrt prior to 3.0.0.4.386_48706 and Asuswrt-Merlin New Gen prior to 386.7.. A specially-crafted HTTP request can lead to memory corruption. An attacker can send a network request to trigger this vulnerability. Affected products include: Asus Asuswrt, Asuswrt-Merlin New Gen, Asus Xt8 Firmware, Asus Tuf-Ax3000 V2 Firmware, Asus Xd4 Firmware. Version information: prior to 3.0.0.4.386.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).