What is CVE-2021-3716?

CVE-2021-3716 is a vulnerability in Nbdkit, classified under Improper Enforcement of Message Integrity During Transmission in a Communication Channel. Published 2022-03-02.

Is CVE-2021-3716 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Nbdkit

CVE-2021-3716

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 se…

EPSS: 0.001 (24.2th percentile) — read the EPSS interpretation.

Affected products

N/a Nbdkit — versions Affects nbdkit v1.12 through v1.26.4 | Fixedin nbdkit v1.26.5

Weakness classification (CWE)

CWE-924 — Improper Enforcement of Message Integrity During Transmission in a Communication Channel

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.openwall.com/lists/oss-security/2021/08/18/2 (x_refsource_MISC)
listman.redhat.com/archives/libguestfs/2021-August/msg00083.html (x_refsource_MISC)
gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fd (x_refsource_MISC)
gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8 (x_refsource_MISC)
bugzilla.redhat.com/show_bug.cgi (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-3716?: CVE-2021-3716 is a vulnerability in Nbdkit, classified under Improper Enforcement of Message Integrity During Transmission in a Communication Channel. Published 2022-03-02.
Is CVE-2021-3716 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.