CVE-2021-4209

moderate-risk
Published 2022-08-24

A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.

Do I need to act?

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0.34% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (5)

Affected Vendors

Redhat Gnu Netapp

References (12)

Third Party Advisory https://access.redhat.com/security/cve/CVE-2021-4209
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2044156
Patch https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da613005...
Third Party Advisory https://gitlab.com/gnutls/gnutls/-/issues/1306
Third Party Advisory https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
Third Party Advisory https://security.netapp.com/advisory/ntap-20220915-0005/
Third Party Advisory https://access.redhat.com/security/cve/CVE-2021-4209
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2044156
Patch https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da613005...
Third Party Advisory https://gitlab.com/gnutls/gnutls/-/issues/1306
Third Party Advisory https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
Third Party Advisory https://security.netapp.com/advisory/ntap-20220915-0005/
37
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 1/34 · Minimal
Exposure 12/34 · Low