CVE-2021-3772

A flaw was found in the Linux SCTP stack. A blind attacker may be able to kill an existing SCTP association through invalid chunks if the attacker knows the IP-addresses and port numbers being used and the attacker can send packets with spoofed IP addresses.

Published: 2022-03-02 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3772 is rated Moderate Risk (49.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.21%). EPSS rose +1.05% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-3772

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.16% 1.21% +1.05%
2 2025-11-21 0.79% 0.16% -0.63%
3 2025-11-18 — 0.79% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3772

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 4.2 [email protected]
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2021-3772

OS Trackers for CVE-2021-3772

vendor priority summary link
debian not yet assigned CVE-2021-3772 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-3772
redhat medium — https://access.redhat.com/security/cve/CVE-2021-3772
suse medium — https://www.suse.com/security/cve/CVE-2021-3772/
ubuntu low CVE-2021-3772 low priority: Ubuntu including 168 source packages (linux, linux-allwinner, …), 2116 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1640, released 227, not-affected 193, ignored 56. https://ubuntu.com/security/CVE-2021-3772

Affected software / configurations for CVE-2021-3772

Vendor Product Version Raw CPE
linux linux_kernel < 5.15.0 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
oracle communications_cloud_native_core_binding_support_function 22.1.3 cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:*
oracle communications_cloud_native_core_network_exposure_function 22.1.1 cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:*
oracle communications_cloud_native_core_policy 22.2.0 cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.0 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.0:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.0.0 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.0.0:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.20 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.20:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.25 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.25:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.30 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.30:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.30.5r3 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.30.5r3:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.40 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.40:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.40.3r2 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.40.3r2:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.40.5 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.40.5:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.50.1 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.50.1:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.50.2 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.50.2:-:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.50.2 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.50.2:p1:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.60 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.60:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.60.0 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.60.0:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.60.1 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.60.1:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.60.3 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.60.3:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.70.1 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.70.1:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller 11.70.2 cpe:2.3:a:netapp:e-series_santricity_os_controller:11.70.2:*:*:*:*:*:*:*
netapp solidfire_\&_hci_management_node — cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
netapp solidfire_\&_hci_storage_node — cpe:2.3:a:netapp:solidfire_\&_hci_storage_node:-:*:*:*:*:*:*:*
netapp hci_compute_node — cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:*
netapp h300s_firmware — cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
netapp h500s_firmware — cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
netapp h700s_firmware — cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
netapp h410s_firmware — cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
netapp h410c_firmware — cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
netapp h610c_firmware — cpe:2.3:o:netapp:h610c_firmware:-:*:*:*:*:*:*:*
netapp h610s_firmware — cpe:2.3:o:netapp:h610s_firmware:-:*:*:*:*:*:*:*
netapp h615c_firmware — cpe:2.3:o:netapp:h615c_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-3772

cvelogic Threat Intelligence