CVE-2021-45839Public exploitNetwork attack vector

Administrator hash disclosure via authorization-exempt mobile actions

Published Apr 25, 2022 · Updated Aug 4, 2024

Information disclosure in TerraMaster TOS 4.2.15-2107141517 on F2-210 and F4-210 allows remote attackers to read administrator password hashes. The webNasIPS and wapNasIPS actions in mobile.class.php bypass the authorization-header check and return the first administrator hash, MAC address, internal IP address, and firmware data to requests carrying TNAS headers. Network access to the NAS web service and attacker-controlled User-Agent and User-Device headers are sufficient, and the disclosed hash and MAC address support administrator-session forgery through a separate flaw.

CVSS severity6.5
Medium
EPSS probability9.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in TerraMaster TOS 4.2.15-2107141517 on F2-210 and F4-210 allows remote attackers to read administrator password hashes. The webNasIPS and wapNasIPS actions in mobile.class.php bypass the authorization-header check and return the first administrator hash, MAC address, internal IP address, and firmware data to requests carrying TNAS headers. Network access to the NAS web service and attacker-controlled User-Agent and User-Device headers are sufficient, and the disclosed hash and MAC address support administrator-session forgery through a separate flaw.

The record

CVE
CVE-2021-45839
Published
Apr 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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