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CVE-2026-24933· NVD / CVE Program· CNA ASUSTOR1

An improper certificate validation vulnerability was found in ADM while sending HTTPS requests to the server.

The API communication component fails to validate the SSL/TLS certificate when sending HTTPS requests to the server. An improper certificates validation vulnerability allows an unauthenticated remote attacker can perform a Man-in-the-Middle (MitM) attack to intercept the cleartext communication, potentially leading to the exposure of sensitive user information, including account emails, MD5 hashed passwords, and device serial numbers. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.ROF1 as well as from ADM 5.0.0 through ADM 5.1.1.RCI1.

HighCVSS 8.9 · v4.0—No exploit No fix recorded
Published
Feb 2, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 10th percentile
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Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · ASUSTOR1
8.9
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
asustordata master

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • asustor data master4.1.0.rhu2 and later · up to 4.3.3.rof1 inclusive
  • asustor data master5.0.0.ra82 and later · before 5.1.2.re51

Versions reported by the vendor

Affected version ranges reported by the assigning authority (ASUSTOR1). Independent of NVD's CPE analysis and usually ahead of it.

  • ASUSTOR ADM

    • 4.1.0 and later · up to and including 4.3.3.ROF1affected
    • 5.0.0 and later · up to and including 5.1.1.RCI1affected

Same product

asustor: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-12313OS command injection in snmp.cgi in ASUSTOR ADM version 3.1.1 allows attackers to execute system commands without authentication via the "ro
    40Plan
  • CVE-2026-6644A command injection vulnerability was found in the PPTP VPN Clients on the ADM
    38Monitor
  • CVE-2026-24936An improper input validation vulnerability was found in ADM while joining a AD Domain.
    38Monitor
  • CVE-2026-3179A path traversal vulnerability was found in the FTP Backup on the ADM.
    36Monitor
  • CVE-2018-12317OS command injection in group.cgi in ASUSTOR ADM version 3.1.1 allows attackers to execute system commands as root by modifying the "name" P
    36Monitor
  • CVE-2018-12316OS Command Injection in upload.cgi in ASUSTOR ADM version 3.1.1 allows attackers to execute system commands by modifying the filename POST p
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-249320 days apartAn improper certificate validation vulnerability was found in ADM while updating the DDNS settings.
    35Monitor
  • CVE-2026-310023 days apartAn improper certificate validation vulnerability was found in the FTP Backup on the ADM.
    33Monitor
  • CVE-2025-1305253 days apartAn improper certificates validation vulnerability was found in the Notification settings of ADM
    28Monitor
  • CVE-2026-249340 days apartAn improper certificate validation vulnerability was found in ADM while querying an external server for the device's WAN IP address.
    25Monitor
  • CVE-2026-249350 days apartAn improper certificate validation vulnerability was found in a third-party NAT traversal module.
    25Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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

nvd-secondary

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

The bug in code

The whole CWE-295 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

kotlin
override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {  // Left empty for the test environment}

Fixed

kotlin
val client = OkHttpClient.Builder()  .certificatePinner(    CertificatePinner.Builder()      .add("api.sirius.example", "sha256/…")      .build()  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records