---
cve: "CVE-2020-37288"
severity: "MEDIUM"
cvss: 6.3
epss: "0.4%"
vendor: "vyperlang"
kev: false
exploited: false
published: "2026-10-21 01:17:18"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-29T11:32:34+01:00"
---

# CVE-2020-37288

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

Vyper from 0.1.0b10 before 0.2.3 generates incorrect code for a return statement inside a for loop in an internal function called two or more internal calls deep, producing an invalid jump destination (stack underflow). Affected contracts revert such calls unnecessarily, which in limited circumstances could enable denial of service against public contracts.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-21 15:51:17
- CNA-CVSS: **6.3** (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-670** — Always-Incorrect Control Flow Implementation
  The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.

## Patch verfügbar (OSV)

- 006968f021b0b0001c0d4fa9465160f1dbfbc453 (Commit)

## Referenzen

- <https://github.com/vyperlang/vyper/security/advisories/GHSA-vg88-3v92-rjx2>
- <https://www.vulncheck.com/advisories/vyper-0.1-0b10-before-0.2.3-invalid-jump-destination-via-return-in-nested-loops>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2020-37288/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_