---
cve: "CVE-2026-102253"
severity: "HIGH"
cvss: 8.7
epss: "0.4%"
vendor: "esnet"
kev: false
exploited: false
published: "2026-09-29 21:17:13"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-01T08:08:06+02:00"
---

# CVE-2026-102253

> 8.7 HIGH · 🧪 PoC

## Beschreibung

iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-09-30 19:25:56
- CNA-CVSS: **8.7** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 |

## Patch verfügbar (OSV)

- 926bd905501b792bd082d2200d1d1a84aa543e3a (Commit)

## Referenzen

- <https://github.com/esnet/iperf/releases/tag/3.22>
- <https://github.com/esnet/iperf/blob/master/RELNOTES.md>
- <https://www.vulncheck.com/advisories/iperf3-udp-receive-worker-infinite-loop-dos>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-102253) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_