CVE-2025-54630VulnerabilityPublished 6 Aug 2025

CVE-2025-54630: Huawei HarmonyOS · Heap-based Buffer Overflow

Affects Huawei HarmonyOSSource CVE Database V5

Not known to be exploited · CVSS 6.8 Medium.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 3.1 base score

6.8Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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

Attack Vector: Physical: The attack requires the attacker to physically touch or manipulate the vulnerable component. Physical interaction may be brief or persistent.
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: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Aug 2025
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 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

Affected software

Product	Affected	Fixed in
Huawei HarmonyOS	Affected =5.0.1 =4.3.0	Fixed in–

AI-suggested

1. Immediate physical security enhancements: Restrict physical access to devices running HarmonyOS, especially in sensitive or critical environments, to prevent exploitation. 2. Monitor for firmware or OS updates from Huawei: Although no patches are currently linked, organizations should prioritize applying official security updates as soon as they become available. 3. Inventory and audit: Identify all Huawei HarmonyOS devices in use, including IoT and embedded systems, and verify their OS versions to assess exposure. 4. Network segmentation: Isolate HarmonyOS devices on separate network segments to limit potential lateral movement if a device is compromised. 5. Implement device hardening: Disable unnecessary services and interfaces on HarmonyOS devices to reduce attack vectors. 6. Incident response readiness: Prepare for potential exploitation scenarios by establishing monitoring for unusual device behavior or crashes indicative of buffer overflow exploitation. 7. Engage with Huawei support: Request detailed guidance and timelines for patches or mitigations specific to this vulnerability. 8. Consider alternative devices or OS versions where feasible, especially in high-risk environments, until the vulnerability is addressed.

Description

:Vulnerability of insufficient data length verification in the DFA module. Impact: Successful exploitation of this vulnerability may affect availability.

Impact

For European organizations, the impact of CVE-2025-54630 depends largely on the deployment of Huawei HarmonyOS devices within their infrastructure. HarmonyOS is primarily used in Huawei's IoT devices, smartphones, and embedded systems. Organizations using Huawei hardware running affected versions could face risks of device crashes or denial of service, impacting operational continuity. The high impact on confidentiality and integrity suggests that sensitive data on these devices could be at risk if exploited. Critical infrastructure or industrial environments using HarmonyOS-powered IoT devices may experience disruptions, potentially affecting service availability. The physical access requirement reduces the likelihood of remote attacks but insider threats or attackers with physical proximity could exploit this vulnerability. This is particularly relevant for sectors with less controlled physical access, such as manufacturing floors, logistics, or public-facing kiosks. Additionally, given Huawei's significant market presence in some European countries, the vulnerability could affect a broad range of devices, increasing the attack surface. The absence of known exploits currently provides a window for proactive mitigation before exploitation becomes widespread.

CWE-122Heap-based Buffer Overflow (opens in a new tab)
Variant weaknessLikelihood of exploit: HighCWE Top 25 (2025): #16
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Pre-design: Use a language or compiler that performs automatic bounds checking.
Architecture and Design
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Forced Integer Overflow (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

consumer.huawei.com/en/support/bulletin/2025/8/ (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Aug 2025, 03:05 UTC

WeaknessesCWE-122

Technical details

References

Community reviews

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