VDB-306791 · CVE-2025-47154 · EUVD-2025-14653

Ladybird LibJS arguments_list missing synchronization ⚔ [Disputed]

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.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Ladybird. Affected by this issue is some unknown functionality of the component LibJS. The manipulation of the argument arguments_list leads to missing synchronization. This vulnerability is documented as CVE-2025-47154. The attack can be initiated remotely. There is not any exploit available. The existence of this vulnerability is still disputed at present. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Ladybird (affected version not known). It has been rated as problematic. This issue affects some unknown functionality of the component LibJS. The manipulation of the argument arguments_list with an unknown input leads to a missing synchronization vulnerability. Using CWE to declare the problem leads to CWE-820. The product utilizes a shared resource in a concurrent manner but does not attempt to synchronize access to the resource. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

LibJS in Ladybird before f5a6704 mishandles the freeing of the vector that arguments_list references, leading to a use-after-free, and allowing remote attackers to execute arbitrary code via a crafted .js file. NOTE: the GitHub README says "Ladybird is in a pre-alpha state, and only suitable for use by developers."

It is possible to read the advisory at news.ycombinator.com. The identification of this vulnerability is CVE-2025-47154 since 05/01/2025. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The real existence of this vulnerability is still doubted at the moment.

Applying the patch f5a670421954fc7130c3685b713c621b29516669 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-14653). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Ladybird

License

open-source

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.2

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 9.0
CNA Vector (MITRE): 🔍

CVSSv2info

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

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

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

Exploitinginfo

Class: Missing synchronization
CWE: CWE-820 / CWE-821
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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: Patch
Status: 🔍

0-Day Time: 🔍

Patch: f5a670421954fc7130c3685b713c621b29516669

Timelineinfo

05/01/2025 🔍
05/01/2025 +0 days 🔍
05/01/2025 +0 days 🔍
05/26/2025 +25 days 🔍

Sourcesinfo

Advisory: news.ycombinator.com
Status: Confirmed
Disputed: 🔍

CVE: CVE-2025-47154 (🔍)
GCVE (CVE): GCVE-0-2025-47154
GCVE (VulDB): GCVE-100-306791
EUVD: 🔍

Entryinfo

Created: 05/01/2025 10:47
Updated: 05/26/2025 22:16
Changes: 05/01/2025 10:47 (64), 05/26/2025 22:16 (1)
Complete: 🔍
Cache ID: 216::103