The Tungstenite crate before 0.20.1 for Rust allows remote attackers to cause a denial of…
Priority LOW 37CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
The Tungstenite crate before 0.20.1 for Rust allows remote attackers to cause a denial of service (minutes of CPU consumption) via an excessive length of an HTTP header in a client handshake. The length affects both how many times a parse is attempted (e.g., thousands of times) and the average amount of data for each parse attempt (e.g., millions of bytes).
Why it matters now
EPSS 0.02057 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed tungstenite (crates.io): 0.20.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | tungstenite (crates.io) | before 0.20.1 | 0.20.1 | Patch available | GHSA-9mcr-873m-xcxp |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- tungstenite (crates.io) Vendor— Affected before 0.20.1 Fixed in 0.20.1 Patch available GHSA-9mcr-873m-xcxp
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:snapview:tungstenite:*:*:*:*:*:rust:*:* | up to 0.20.0 | Vulnerable | Snapview |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* | 38 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | 39 | Vulnerable | Fedoraproject |
- cpe:2.3:a:snapview:tungstenite:*:*:*:*:*:rust:*:* Versions up to 0.20.0 Vulnerable ·Snapview
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* Versions 38 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-9mcr-873m-xcxp tungstenite (crates.io) Fixed in 0.20.1 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2023-43669
- 2026-10-03 Alias added: GHSA-9mcr-873m-xcxp
References
Patch 2
Advisory 8
- https://github.com/advisories/GHSA-9mcr-873m-xcxp
- https://bugzilla.suse.com/show_bug.cgi?id=1215563
- https://bugzilla.redhat.com/show_bug.cgi?id=2240110
- https://security-tracker.debian.org/tracker/CVE-2023-43669
- FEDORA-2023-91a66898d2
- FEDORA-2023-e72bf7b92e
- FEDORA-2023-9c4142423a
- https://nvd.nist.gov/vuln/detail/CVE-2023-43669
Other 11
- https://cwe.mitre.org/data/definitions/407.html
- https://crates.io/crates/tungstenite/versions
- https://github.com/snapview/tungstenite-rs/pull/379
- https://rustsec.org/advisories/RUSTSEC-2023-0065.html
- https://lists.fedoraproject.org/archives/list/[email protected]/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D
- https://lists.fedoraproject.org/archives/list/[email protected]/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK
- https://lists.fedoraproject.org/archives/list/[email protected]/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM
- https://github.com/snapview/tungstenite-rs
Sources
- CVE-2023-43669 · CVE Program
- CVE-2023-43669 · NVD
- FIRST EPSS
- GHSA-9mcr-873m-xcxp · GitHub Advisory Database · CC BY 4.0
- CVE-2023-43669 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences