How severe is CVE-2024-27094?

CVE-2024-27094 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2024-27094 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-27094?

CVE-2024-27094 primarily affects Openzeppelin Contracts. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-27094?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-27094 have an EU (EUVD) identifier?

Yes. CVE-2024-27094 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0602.

When was CVE-2024-27094 published?

CVE-2024-27094 was published on 2024-03-21 and last updated on 2026-06-17.

CVE-2024-27094

CVE-2024-27094 is a medium-severity vulnerability in Openzeppelin Contracts with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0602
Weakness: CWE-125
Affected product: Openzeppelin Contracts
Published: 2024-03-21
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2024-27094?: 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.
How severe is CVE-2024-27094?: CVE-2024-27094 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2024-27094 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-27094?: CVE-2024-27094 primarily affects Openzeppelin Contracts. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-27094?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-27094 have an EU (EUVD) identifier?: Yes. CVE-2024-27094 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0602.
When was CVE-2024-27094 published?: CVE-2024-27094 was published on 2024-03-21 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:openzeppelin:contracts:*:*:*:*:*:node.js:*:*
cpe:2.3:a:openzeppelin:contracts_upgradeable:*:*:*:*:*:node.js:*:*

More vulnerabilities in Openzeppelin Contracts

CVE-2021-39168 — Critical (CVSS 10.0): OpenZepplin is a library for smart contract development. In affected versions a vulnerability in TimelockController…
CVE-2021-39167 — Critical (CVSS 10.0): OpenZepplin is a library for smart contract development. In affected versions a vulnerability in TimelockController…
CVE-2021-41264 — Critical (CVSS 9.8): OpenZeppelin Contracts is a library for smart contract development. In affected versions upgradeable contracts using…
CVE-2022-35961 — High (CVSS 7.9): OpenZeppelin Contracts is a library for secure smart contract development. The functions `ECDSA.recover` and…
CVE-2022-31198 — High (CVSS 7.5): OpenZeppelin Contracts is a library for secure smart contract development. This issue concerns instances of Governor…
CVE-2022-31172 — High (CVSS 7.5): OpenZeppelin Contracts is a library for smart contract development. Versions 4.1.0 until 4.7.1 are vulnerable to the…

All CVEs affecting Openzeppelin Contracts →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →