CVE-2021-31227: An issue was discovered in HCC embedded InterNiche 4.0.1

Q: How do I fix CVE-2021-31227?

nichestack: upgrade to 4.3. Exact commands for each OS are on this page.

Q: Is CVE-2021-31227 being exploited?

CVE-2021-31227 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-31227 affect?

CVE-2021-31227 affects nichestack. Severity is high (CVSS 7.5). An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to an incorrect signed integer comparison. This vulnerability requires the attacker to send

Q: How urgent is CVE-2021-31227?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2021-31227 is a high-severity flaw (CVSS 7.5) affecting nichestack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to an incorrect signed integer comparison. This vulnerability requires the attacker to send a malformed HTTP packet with a negative Content-Length, which bypasses the size checks and results in a large heap overflow in the wbs_multidata buffer copy.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-08-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hcc-embedded

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-19 11:15 UTCPublished CVE record published
2026-06-17 03:51 UTCUpdated Record last modified

hcc-embedded nichestack UPGRADE

Affected: < 4.3

Fixed in: 4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nichestack || rpm -q nichestack || nichestack --version

2. UPGRADE to 4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nichestack

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nichestack

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-31227?

nichestack: upgrade to 4.3. Exact commands for each OS are on this page.

Is CVE-2021-31227 being exploited?

CVE-2021-31227 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-31227 affect?

CVE-2021-31227 affects nichestack. Severity is high (CVSS 7.5). An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to an incorrect signed integer comparison. This vulnerability requires the attacker to send

How urgent is CVE-2021-31227?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-36762 HIGH 7.5 UPGRADE An issue was discovered in HCC Embedded InterNiche NicheStack through 4.3
CVE-2021-31401 HIGH 7.5 UPGRADE UPGRADE An issue was discovered in tcp_rcv() in nptcp.c in HCC embedded InterNiche 4.0.1
CVE-2021-31400 HIGH 7.5 UPGRADE An issue was discovered in tcp_pulloutofband() in tcp_in.c in HCC embedded InterNiche 4.0.1
CVE-2021-31228 HIGH 7.5 UPGRADE An issue was discovered in HCC embedded InterNiche 4.0.1
CVE-2021-27565 HIGH 7.5 UPGRADE The web server in InterNiche NicheStack through 4.0.1 allows remote attackers to cause a denial of service (in

References

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