# CVE-2023-46589: Apache Tomcat: HTTP request smuggling via malformed trailer headers

- Exploited (CISA KEV): no
- Published: 2023-11-28
- CVSS: 7.5 HIGH (v3.1)
- EPSS: 2.7% (86th percentile)
- CWE: CWE-444

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single 
request as multiple requests leading to the possibility of request 
smuggling when behind a reverse proxy.


Older, EOL versions may also be affected.


Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2024-01-16 | 49 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2024-01-16 · new · rule 200020217
  > Added: signature 200020217 "Trailing HTTP Header in Chunked Request" (HTTP Parser Attack, risk High), systems: Apache Tomcat. References: CVE-2023-46589.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2023-46589 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2023-46589