CVE-2017-8819
An attacker can send many INTRODUCE2 cells to trigger this issue.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, the replay-cache protection mechanism is ineffective for v2 onion services, aka TROVE-2017-009. An attacker can send many INTRODUCE2 cells to trigger this issue.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.94% probability · 80th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- tor project/tor · debian/debian linux
- Source
- security@debian.org
EPSS 1.9% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516Vendor Advisory
- https://bugs.torproject.org/24244Vendor Advisory
- https://www.debian.org/security/2017/dsa-4054Third Party Advisory
- https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516Vendor Advisory
- https://bugs.torproject.org/24244Vendor Advisory
- https://www.debian.org/security/2017/dsa-4054Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.