CVE-2022-27666

A heap buffer overflow flaw was found in IPsec ESP transformation code in net/ipv4/esp4.c and net/ipv6/esp6.c. This flaw allows a local attacker with a normal user privilege to overwrite kernel heap objects and may cause a local privilege escalation threat.

Published: 2022-03-23 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-27666 is rated High Risk (66.4/100): CVSS High severity, with high exploitation likelihood (EPSS 4.53%, 90th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.62% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize 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-2022-27666

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 0.91% 4.53% +3.62%
2 2026-05-30 1.04% 0.91% -0.13%
3 2026-05-29 — 1.04% —

Full EPSS history (33 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-27666

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2022-27666

OS Trackers for CVE-2022-27666

vendor priority summary link
debian not yet assigned CVE-2022-27666 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-2022-27666
redhat high — https://access.redhat.com/security/cve/CVE-2022-27666
suse high CVE-2022-27666 severity important: SUSE including 380 source package names (bpftool-4.18.0-372.13.1.el8_6, bpftool-5.14.0-70.17.1.el9_0, …), 1066 product×package rows across 124 product lines (Container suse/sle-micro-rancher/5.2, HPE Helion OpenStack 8, … (124 product lines)): Fixed 927, Known Not Affected 139. https://www.suse.com/security/cve/CVE-2022-27666/
ubuntu medium CVE-2022-27666 medium priority: Ubuntu including 167 source packages (linux, linux-allwinner, …), 2042 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1576, released 212, not-affected 198, ignored 56. https://ubuntu.com/security/CVE-2022-27666

Affected software / configurations for CVE-2022-27666

Vendor Product Version Raw CPE
linux linux_kernel < 5.17 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:-:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:rc4:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:rc5:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:rc6:*:*:*:*:*:*
linux linux_kernel 5.17 cpe:2.3:o:linux:linux_kernel:5.17:rc7:*:*:*:*:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
redhat virtualization 4.0 cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
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 h300e_firmware — cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
netapp h500e_firmware — cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
netapp h700e_firmware — cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
netapp h410s_firmware — cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
netapp h410c_firmware — cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2022-27666

cvelogic Threat Intelligence