CVE-2025-21607: low-severity vulnerability in vyperlang vyper
Success of Certain Precompile Calls not Checked in Vyper
Published · Updated
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8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 2.3epss 0.7%
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.
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
vyperlang · vyperRelated CVEs — vyperlang vyper
In the same product, most dangerous first.
CVE-2024-24563CRITICALVyper array negative index vulnerabilityEPSS 1.5%CVE-2022-24845HIGHInteger bounds error in VyperEPSS 1.4%CVE-2022-29255HIGHMultiple evaluation of contract address in call in vyperEPSS 1.3%CVE-2023-31146HIGHVyper vulnerable to OOB DynArray access when array is on both LHS and RHS of an assignmentEPSS 1.3%CVE-2021-41121HIGHMemory corruption in VyperEPSS 1.1%CVE-2022-24787HIGHIncorrect Comparison in VyperEPSS 1.0%