CVE-2022-33903

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

7.5 HighFix available

CVE-2022-33903 is a high vulnerability (CVSS 7.5) in Torproject Tor, published June 22, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.34%, the 71st percentile. Fixed in tor 0.4.7.8-r0.

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

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

1.34%Up 0.5 points since Jul 18, 2022

What each source reports

NVD Score used 7.5

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Record: CVE-2022-33903
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

CVE List No score

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Record: CVE-2022-33903
Updated: 2026-11-02

EUVDEUVD-2022-36940 No score

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Record: EUVD-2022-36940
Updated: 2026-11-03

GitHub AdvisoriesGHSA-g7xf-5c64-42cx 7.5

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Record: GHSA-g7xf-5c64-42cx
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVALPINE-CVE-2022-33903 7.5

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Record: ALPINE-CVE-2022-33903
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

OSVDEBIAN-CVE-2022-33903 7.5

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Record: DEBIAN-CVE-2022-33903
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

OSV No score

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Record: CVE-2022-33903
Updated: 2026-11-02

OSVopenSUSE-SU-2022:10023-1 No score

Security update for tor

This update for tor fixes the following issues:

tor was updated to 0.4.7.8:

Fix a scenario where RTT estimation can become wedged, seriously degrading congestion control performance on all circuits. This impacts clients, onion services, and relays, and can be triggered remotely by a malicious endpoint. (TROVE-2022-001, CVE-2022-33903, boo#1200672)
Regenerate fallback directories generated on June 17, 2022.
Update the geoip files to match the IPFire Location Database, as retrieved on 2022/06/17.
Allow the rseq system call in the sandbox
logging bug fixes

Record: openSUSE-SU-2022:10023-1
Updated: 2026-11-02

OSVopenSUSE-SU-2024:12149-1 No score

tor-0.4.7.8-1.1 on GA media

These are all security issues fixed in the tor-0.4.7.8-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:12149-1
Updated: 2026-11-02

Affected products

torproject tor

Affected packages

Affected packages
Package	Affected	Fixed
`tor` Alpine:v3.16	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.17	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.18	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.19	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.20	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.21	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.22	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.23	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Alpine:v3.24	0.4.7.1 up to 0.4.7.8-r0	0.4.7.8-r0
`tor` Debian:12	before 0.4.7.8-1	0.4.7.8-1

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Affected packages
Package	Affected	Fixed
`tor` Debian:13	before 0.4.7.8-1	0.4.7.8-1
`tor` Debian:14	before 0.4.7.8-1	0.4.7.8-1
`tor` SUSE:Package Hub 15 SP3	before 0.4.7.8-bp154.2.3.1	0.4.7.8-bp154.2.3.1
`tor` SUSE:Package Hub 15 SP4	before 0.4.7.8-bp154.2.3.1	0.4.7.8-bp154.2.3.1
`tor` openSUSE:Leap 15.3	before 0.4.7.8-bp154.2.3.1	0.4.7.8-bp154.2.3.1
`tor` openSUSE:Leap 15.4	before 0.4.7.8-bp154.2.3.1	0.4.7.8-bp154.2.3.1
`tor` openSUSE:Tumbleweed	before 0.4.7.8-1.1	0.4.7.8-1.1

History

History
When	Changed	Sources
2026-11-03	affected, aliases, references	OSV
2026-11-03	aliases	EUVD
2026-11-02	created	CVE List, GitHub Advisories, NVD, OSV

References

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