How severe is CVE-2023-30837?

CVE-2023-30837 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2023-30837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-30837?

CVE-2023-30837 affects Vyperlang Vyper. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-30837?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-30837 published?

CVE-2023-30837 was published on 2023-05-08 and last updated on 2026-06-17.

CVE-2023-30837

CVE-2023-30837 is a high-severity vulnerability in Vyperlang Vyper with a CVSS 3.x base score of 7.5. 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-789.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-789
Affected product: Vyperlang Vyper
Published: 2023-05-08
Last modified: 2026-06-17

Description

Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflows in versions prior to 0.3.8. An attacker can overwrite the owner variable. This issue was fixed in version 0.3.8.

Frequently asked questions

What is CVE-2023-30837?: Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflows in versions prior to 0.3.8. An attacker can overwrite the owner variable. This issue was fixed in version 0.3.8.
How severe is CVE-2023-30837?: CVE-2023-30837 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2023-30837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-30837?: CVE-2023-30837 affects Vyperlang Vyper. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-30837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-30837 published?: CVE-2023-30837 was published on 2023-05-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:*:*:*

More vulnerabilities in Vyperlang Vyper

CVE-2024-24563 — Critical (CVSS 9.8): Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. Arrays can be keyed by a signed integer,…
CVE-2024-24561 — Critical (CVSS 9.8): Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. In versions 0.3.10 and earlier, the…
CVE-2025-27105 — Critical (CVSS 9.1): vyper is a Pythonic Smart Contract Language for the EVM. Vyper handles AugAssign statements by first caching the target…
CVE-2022-24845 — High (CVSS 8.8): Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. In affected versions, the return of…
CVE-2022-29255 — High (CVSS 8.2): Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions prior to 0.3.4 when a calling…
CVE-2023-42443 — High (CVSS 8.1): Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). In version 0.3.9 and prior, under…

All CVEs affecting Vyperlang Vyper →

Other CWE-789 vulnerabilities

CVE-2021-34869 — High (CVSS 8.8): This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop…
CVE-2021-34868 — High (CVSS 8.8): This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop…
CVE-2024-20260 — High (CVSS 8.6): A vulnerability in the VPN and management web servers of the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco…
CVE-2021-34867 — High (CVSS 8.2): This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop…
CVE-2026-20048 — High (CVSS 7.7): A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches…
CVE-2026-55380 — High (CVSS 7.5): Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from…

Browse all CWE-789 vulnerabilities →