---
cve: "CVE-2021-43980"
severity: "LOW"
cvss: 3.7
epss: "2%"
vendor: "Apache Software Foundation"
kev: false
exploited: false
published: "2022-09-28 14:15:09"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T09:42:44+02:00"
---

# CVE-2021-43980

> 3.7 LOW

## Beschreibung

The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Referenzen

- <https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3>
- <http://www.openwall.com/lists/oss-security/2022/09/28/1>
- <https://lists.debian.org/debian-lts-announce/2022/10/msg00029.html>
- <https://www.debian.org/security/2022/dsa-5265>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-43980) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_