VDB-349185 · CVE-2026-28540 · GCVE-0-2026-28540

Huawei HarmonyOS 5.1.0/6.0.0 null byte or nul character

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.5	$0-$5k	0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Huawei HarmonyOS 5.1.0/6.0.0. Affected by this issue is some unknown functionality. Performing a manipulation results in improper neutralization of null byte or nul character. This vulnerability is known as CVE-2026-28540. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Huawei HarmonyOS 5.1.0/6.0.0. This affects an unknown code. The manipulation with an unknown input leads to a improper neutralization of null byte or nul character vulnerability. CWE is classifying the issue as CWE-158. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component. This is going to have an impact on confidentiality. The summary by CVE is:

Out-of-bounds character read vulnerability in Bluetooth. Impact: Successful exploitation of this vulnerability may affect service confidentiality.

The advisory is shared at consumer.huawei.com. This vulnerability is uniquely identified as CVE-2026-28540 since 02/28/2026. The exploitability is told to be easy. An attack has to be approached locally. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/07/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Smartphone Operating System

Vendor

Huawei

Name

HarmonyOS

Version

License

commercial

Website

Vendor: https://www.huawei.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 3.3
NVD Vector: 🔒

CNA Base Score: 4.0
CNA Vector (huawei): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper neutralization of null byte or nul character
CWE: CWE-158 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/28/2026 CVE reserved
03/05/2026 +5 days Advisory disclosed
03/05/2026 +0 days VulDB entry created
03/07/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: huawei.com

Advisory: consumer.huawei.com
Status: Confirmed

CVE: CVE-2026-28540 (🔒)
GCVE (CVE): GCVE-0-2026-28540
GCVE (VulDB): GCVE-100-349185

Entryinfo

Created: 03/05/2026 14:46
Updated: 03/07/2026 20:23
Changes: 03/05/2026 14:46 (61), 03/07/2026 20:23 (11)
Complete: 🔍
Cache ID: 216::103