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CVE-2021-31889

CRITICALCVSS 9.1/10EPSS 2.42%

Last modified

CVE-2021-31889 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0). Malformed TCP packets with a corrupted SACK option leads to Information Leaks and Denial-of-Service conditions. EPSS estimates a 2.42% chance of exploitation in the next 30 days.

Description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0). Malformed TCP packets with a corrupted SACK option leads to Information Leaks and Denial-of-Service conditions. (FSMD-2021-0015)

Metrics

CVSS 3.1
9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability
2.42%

82.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
SiemensCapital VstarAll versions
SiemensNucleus NetAll versions
SiemensNucleus Readystart V3< 2017.02.3
SiemensNucleus Source CodeAll versions
SiemensApogee Modular Building Controller FirmwareAll versions
SiemensApogee Modular Equiment Controller FirmwareAll versions
SiemensApogee Pxc Compact FirmwareAll versions
SiemensApogee Pxc Modular FirmwareAll versions
SiemensTalon Tc Compact FirmwareAll versions
SiemensTalon Tc Modular FirmwareAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-31889?
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0). Malformed TCP packets with a corrupted SACK option leads to Information Leaks and Denial-of-Service conditions. (FSMD-2021-0015)
How severe is CVE-2021-31889?
CVE-2021-31889 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 2.42% probability of exploitation in the next 30 days.
How do I fix CVE-2021-31889?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31889?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST