CVE-2023-43669
Tungstenite allows remote attackers to cause a denial of service
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).
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used 7.5
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).
- Record
CVE-2023-43669- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
CVE ListNo score
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).
- Record
CVE-2023-43669- Updated
- 2026-11-02
EUVDEUVD-2023-2481No score
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).
- Record
EUVD-2023-2481- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9mcr-873m-xcxp 7.5
Tungstenite allows remote attackers to cause a denial of service
The Tungstenite crate through 0.20.0 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).
- Record
GHSA-9mcr-873m-xcxp- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2023-43669 7.5
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).
- Record
DEBIAN-CVE-2023-43669- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVGHSA-9mcr-873m-xcxp 7.5
Tungstenite allows remote attackers to cause a denial of service
The Tungstenite crate through 0.20.0 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).
- Record
GHSA-9mcr-873m-xcxp- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
OSVRUSTSEC-2023-0065 7.5
Tungstenite allows remote attackers to cause a denial of service
The Tungstenite crate through 0.20.0 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).
- Record
RUSTSEC-2023-0065- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2023-43669 7.5
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).
- Record
UBUNTU-CVE-2023-43669- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVNo score
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).
- Record
CVE-2023-43669- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
tungstenitecrates.io | through 0.20.0 | 0.20.1 |
rust-tungsteniteDebian:13 | before 0.20.1-1 | 0.20.1-1 |
rust-tungsteniteDebian:14 | before 0.20.1-1 | 0.20.1-1 |
tungstenitecrates.io | before 0.20.1 | 0.20.1 |
tungstenitecrates.io | 0.0.0-0 up to 0.20.1 | 0.20.1 |
rust-tungsteniteUbuntu:24.04:LTS | All versions, plus listed versions 0.20.1-10.20.1-2 | None known |
rust-tungsteniteUbuntu:25.10 | All versions, plus listed versions 0.24.0-30.24.0-4 | None known |
rust-tungsteniteUbuntu:26.10 | All versions, plus listed versions 0.28.0-1 | None known |
rust-tungsteniteUbuntu:26.04:LTS | All versions, plus listed versions 0.24.0-40.24.0-50.28.0-1 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-43669 is a high vulnerability (CVSS 7.5) in Snapview Tungstenite, published September 21, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.06%, the 81st percentile. Fixed in tungstenite 0.20.1.
References
github.com/snapview/tungstenite-rs/issues/376
cwe.mitre.org/data/definitions/407.html
crates.io/crates/tungstenite/versions
github.com/snapview/tungstenite-rs/commit/8b3ecd3cc0008145ab4bc8d0657c39d09db8c7e2
github.com/advisories/GHSA-9mcr-873m-xcxp
github.com/github/advisory-database/pull/2752
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bugzilla.suse.com/show_bug.cgi?id=1215563
bugzilla.redhat.com/show_bug.cgi?id=2240110
security-tracker.debian.org/tracker/CVE-2023-43669
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM
nvd.nist.gov/vuln/detail/CVE-2023-43669
github.com/snapview/tungstenite-rs/pull/379
rustsec.org/advisories/RUSTSEC-2023-0065.html
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D
github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43669.json
github.com/snapview/tungstenite-rs
crates.io/crates/tungstenite
ubuntu.com/security/CVE-2023-43669
github.com/snapview/tungstenite-rs/commit/f916b332a97f78f4d54d942b9e008a1af57ff938
github.com/snapview/tungstenite-rs/commit/2e5029284b8bef3e59df0c9d3920c0ed6c7da7a9
cve.org/CVERecord?id=CVE-2023-43669