Is CVE-2025-21607 actively exploited?

No active exploitation of CVE-2025-21607 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-21607 be exploited remotely?

Yes. CVE-2025-21607 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-21607?

CVE-2025-21607 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2025-21607

HIGH

CVE-2025-21607

CWE-670Published: January 14, 2025· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

Vyper is a Pythonic Smart Contract Language for the EVM. When the Vyper Compiler uses the precompiles EcRecover (0x1) and Identity (0x4), the success flag of the call is not checked. As a consequence an attacker can provide a specific amount of gas to make these calls fail but let the overall execution continue. Then the execution result can be incorrect. Based on EVM's rules, after the failed precompile the remaining code has only 1/64 of the pre-call-gas left (as 63/64 were forwarded and spent). Hence, only fairly simple executions can follow the failed precompile calls. Therefore, we found no significantly impacted real-world contracts. None the less an advisory has been made out of an abundance of caution. This issue is fixed in 0.4.1.

NVD Source

Technical Analysis

CVE-2025-21607 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.