CVE-2026-18187
A format string vulnerability was found in the Internal Backup on the ADM
Description
A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability occurs because user-controlled task input may be included in an error response and processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected CGI process. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81.
INFO
Published Date :
July 30, 2026, 3:16 a.m.
Last Modified :
Aug. 4, 2026, 2:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | f35eaae9-79f2-4d0d-a5c7-7bea6ed6be77 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Apply vendor patches for ADM versions.
- Update ADM to a fixed version.
- Restrict user input in error responses.
- Avoid unsafe format string operations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-18187.
| URL | Resource |
|---|---|
| https://www.asustor.com/security/security_advisory_detail?id=67 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-18187 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-18187
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-18187 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-18187 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 04, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CPE Configuration OR *cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:* versions from (including) 4.1.0.rhu2 up to (including) 4.3.3.run1 *cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:* versions from (including) 5.0.0.ra82 up to (excluding) 5.1.4.rjv2 Added Reference Type ASUSTOR, Inc.: https://www.asustor.com/security/security_advisory_detail?id=67 Types: Vendor Advisory -
CVE Modified by [email protected]
Aug. 04, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'ASUSTOR Inc.', 'product': 'ADM', 'versions': [{'status': 'affected', 'version': '5.0.0', 'versionType': 'custom', 'lessThanOrEqual': '5.1.3.RI81'}, {'status': 'affected', 'version': '4.1.0', 'versionType': 'custom', 'lessThanOrEqual': '4.3.3.RUN1'}], 'packageName': 'Internal Backup', 'defaultStatus': 'unaffected'}] [{'vendor': 'ASUSTOR Inc.', 'product': 'ADM', 'versions': [{'status': 'affected', 'version': '5.0.0', 'versionType': 'custom', 'lessThanOrEqual': '5.1.3.RI81'}, {'status': 'affected', 'version': '4.1.0', 'versionType': 'custom', 'lessThanOrEqual': '4.3.3.RUN1'}], 'platforms': ['Linux', 'x86', 'ARM', '64 bit'], 'packageName': 'Internal Backup', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 30, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-18187', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-30T13:20:28.078436Z'} -
New CVE Received by [email protected]
Jul. 30, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'ASUSTOR Inc.', 'product': 'ADM', 'versions': [{'status': 'affected', 'version': '5.0.0', 'versionType': 'custom', 'lessThanOrEqual': '5.1.3.RI81'}, {'status': 'affected', 'version': '4.1.0', 'versionType': 'custom', 'lessThanOrEqual': '4.3.3.RUN1'}], 'packageName': 'Internal Backup', 'defaultStatus': 'unaffected'}] Added Description A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability occurs because user-controlled task input may be included in an error response and processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected CGI process. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-134 Added Reference https://www.asustor.com/security/security_advisory_detail?id=67