CVE-2021-3716: nbdkit_project nbdkit
Vulnerability summary
CVE-2021-3716 is a low (CVSS 3.5) vulnerability in nbdkit_project nbdkit. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 47% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 02-03-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · DebianEcosystem advisory · calculated3.1LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
- NVDNIST3.1LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
EPSS trend
Probability
0.58%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
0.00 pp
From 0.58% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- nbdkit< 1.26.5-1
Nbdkit_project1 product
- nbdkit≥ 1.11.8, < 1.24.6 | ≥ 1.25.1, < 1.26.5 | ≥ 1.27.1, < 1.27.6
Opensuse1 product
- nbdkit&distro=openSUSE Tumbleweed< 1.27.8-1.2
Redhat1 product
Ubuntu1 product
- nbdkitAll versions (No fix recorded)
5 vendors · 5 products
References
12 links- gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fdX Refsource MISCPatchThird Party Advisory
- gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8X Refsource MISCPatchThird Party Advisory
