OpenZeppelin openzeppelin-contracts up to 4.9.5/5.0.0-rc0 Base64.encode out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in OpenZeppelin openzeppelin-contracts up to 4.9.5/5.0.0-rc0 and classified as problematic. This impacts the function Base64.encode. Such manipulation leads to out-of-bounds. This vulnerability is listed as CVE-2024-27094. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenZeppelin openzeppelin-contracts up to 4.9.5/5.0.0-rc0 and classified as problematic. Affected by this issue is the function Base64.encode. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. CVE summarizes:

OpenZeppelin Contracts is a library for secure smart contract development. The `Base64.encode` function encodes a `bytes` input by iterating over it in chunks of 3 bytes. When this input is not a multiple of 3, the last iteration may read parts of the memory that are beyond the input buffer. The vulnerability is fixed in 5.0.2 and 4.9.6.

The weakness was presented 02/29/2024 as GHSA-9vx6-7xxf-x967. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2024-27094 since 02/19/2024. There are known technical details, but no exploit is available.

Upgrading to version 4.9.6 or 5.0.2 eliminates this vulnerability. Applying the patch 2d081f24cac1a867f6f73d512f2022e1fa987854 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.4
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: openzeppelin-contracts 4.9.6/5.0.2
Patch: 2d081f24cac1a867f6f73d512f2022e1fa987854

Timelineinfo

02/19/2024 🔍
02/29/2024 +10 days 🔍
02/29/2024 +0 days 🔍
12/05/2025 +645 days 🔍

Sourcesinfo

Product: github.com

Advisory: GHSA-9vx6-7xxf-x967
Status: Confirmed

CVE: CVE-2024-27094 (🔍)
GCVE (CVE): GCVE-0-2024-27094
GCVE (VulDB): GCVE-100-255308

Entryinfo

Created: 02/29/2024 20:53
Updated: 12/05/2025 06:45
Changes: 02/29/2024 20:53 (52), 04/03/2024 14:22 (15), 12/05/2025 06:45 (13)
Complete: 🔍
Cache ID: 216::103

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