SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2021-41837

Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM.

HIGH 8.2EPSS 0.28%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

An issue was discovered in AhciBusDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

CVSS 3.1
8.2 HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS
0.28% probability · 21th percentile
CISA KEV
Not listed
Weakness
CWE-119
Affected
insyde/insydeh2o · siemens/simatic field pg m5 firmware · siemens/simatic field pg m6 firmware · siemens/simatic ipc127e firmware · siemens/simatic ipc227g firmware · siemens/simatic ipc277g firmware · siemens/simatic ipc327g firmware · siemens/simatic ipc377g firmware · siemens/simatic ipc427e firmware · siemens/simatic ipc477e firmware · siemens/simatic ipc627e firmware · siemens/simatic ipc647e firmware · siemens/simatic ipc677e firmware · siemens/simatic ipc847e firmware · siemens/simatic itp1000 firmware
Source
cve@mitre.org

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.