Is CVE-2021-31401 in the CISA KEV catalog?

No. CVE-2021-31401 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31401?

CVE-2021-31401 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-31401?

CVE-2021-31401 has an EPSS score of 2.25% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31401?

Upgrade nichestack to 4.3 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-31401

HIGHEPSS 81th pctl

7.5

CVSS v3

NVD

Description

An issue was discovered in tcp_rcv() in nptcp.c in HCC embedded InterNiche 4.0.1. The TCP header processing code doesn't sanitize the value of the IP total length field (header length + data length). With a crafted IP packet, an integer overflow occurs whenever the value of the IP data length is calculated by subtracting the length of the header from the total length of the IP packet.

CWE-20Improper Input Validation

How to fix

Remediation Available

nichestackNVD

Affected:< 4.3Fixed in:4.3CVE-2021-31401derived from NVD

sentron 3wa com190 firmwareNVD

Affected:< 2.0.0Fixed in:2.0.0CVE-2021-31401derived from NVD

sentron 3wl com35 firmwareNVD

Affected:< 1.2.0Fixed in:1.2.0CVE-2021-31401derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.25%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Mitigation2

Third-Party Advisory1

kb.cert.org

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.