VulnerabilityPublished 14 Jun 2024Updated 2 Aug 2024

CVE-2024-34539: TerraMaster TOS firmware · Use of Hard-coded Password

Source CVE Database V5

Not known to be exploited · CVSS 9.4 Critical.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

9.4Critical

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Affects: TerraMaster TOS firmware through 5.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Jun 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

To mitigate CVE-2024-34539 effectively, organizations should first isolate affected TerraMaster devices from untrusted networks, especially the internet, to prevent remote exploitation. Disable mail and webmail services on the device if they are not essential, reducing the attack surface. Implement strict network segmentation and firewall rules to restrict access to the NAS administration interfaces to trusted internal hosts only. Monitor network traffic and device logs for unusual login attempts or access patterns indicative of exploitation attempts. Where possible, replace vulnerable devices or downgrade services until a vendor patch is released. Engage with TerraMaster support to obtain official guidance and updates. Employ compensating controls such as multi-factor authentication on network access points and regular backups stored offline to mitigate potential data loss. Maintain heightened vigilance for threat intelligence updates regarding this vulnerability and any emerging exploits.

Description

Hardcoded credentials in TerraMaster TOS firmware through 5.1 allow a remote attacker to successfully login to the mail or webmail server. These credentials can also be used to login to the administration panel and to perform privileged actions.

Impact

The impact of CVE-2024-34539 is severe for organizations using TerraMaster NAS devices with affected firmware. Successful exploitation allows attackers to bypass authentication entirely and gain full administrative access, compromising the confidentiality and integrity of stored data. Attackers can manipulate device configurations, access sensitive information, intercept or manipulate mail services, and potentially use the compromised device as a foothold for lateral movement within corporate networks. Given the critical nature of NAS devices in data storage and backup, this vulnerability threatens business continuity and data security. Organizations relying on TerraMaster for critical storage or mail services face risks of data breaches, ransomware deployment, or espionage. The ease of exploitation and remote accessibility increase the likelihood of attacks, especially in environments where these devices are exposed to untrusted networks or the internet. The absence of patches further exacerbates the risk, necessitating immediate defensive measures.

CWE-259Use of Hard-coded Password (opens in a new tab)
Variant weaknessLikelihood of exploit: HighOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product contains a hard-coded password, which it uses for its own inbound authentication or for outbound communication to external components.
Architecture and Design
For outbound authentication: store passwords outside of the code in a strongly-protected, encrypted configuration file or database that is protected from access by all outsiders, including other local users on the same system. Properly protect the key (CWE-320).
Architecture and Design
For inbound authentication: Rather than hard-code a default username and password for first time logins, utilize a "first login" mode that requires the user to enter a unique strong password.
Architecture and Design
Perform access control checks and limit which entities can access the feature that requires the hard-coded password. For example, a feature might only be enabled through the system console instead of through a network connection.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V2.3.1 (opens in a new tab)
V2.6.2 (opens in a new tab)
V2.8.5 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

shinnai.altervista.org/exploits/SH-20240611-CVE-2024-34539.html (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 26 Feb 2026, 04:47 UTC

WeaknessesCWE-259

Technical details

References

Community reviews

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