CVE-2021-38173
Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH commands using ssh_filter_btrbk.sh in authorized_keys.
02 Description
Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH commands using ssh_filter_btrbk.sh in authorized_keys.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 3.15% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 87.8% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-08-07 18:58Z5 YR AGO
- Last updated
- 2024-08-04 01:37Z2 YR AGO
- Reserved
- 2021-08-07
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')Class
- Data version
- 5.1
- Document digest
- ad94b18784e9dc0147a070a38bb1c968af2cc0649bf6e423cd7263104dbe3a0a
05 Affected products
06 References
- github.comhttps://github.com/digint/btrbk/commit/58212de771c381cd4fa05625927080bf264e9584
- github.comhttps://github.com/digint/btrbk/blob/master/ChangeLog
- lists.debian.org[debian-lts-announce] 20210905 [SECURITY] [DLA 2755-1] btrbk security updatehttps://lists.debian.org/debian-lts-announce/2021/09/msg00002.html
- lists.fedoraproject.orgFEDORA-2022-dc62389784https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LM7GLTUN5YS4KE2RNBX732EAMVVGNEX3/
- lists.fedoraproject.orgFEDORA-2022-a66734e7a2https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP2T32JMENJFRP2HWXR7FTTZVRTTPECL/
07 Fixed in
Debian 12
- btrbk Fixed in 0.27.1-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- btrbk Fixed in 0.27.1-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- btrbk Fixed in 0.27.1-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- btrbk No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- btrbk No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.