CVE-2016-20045: HNB Organizer 1.9.18-10 contains a local buffer overflow vulnerability that allows local attackers to execute

Q: How do I fix CVE-2016-20045?

hierarchical notebook: upgrade to newer than 1.9.18-10. Exact commands for each OS are on this page.

Q: Is CVE-2016-20045 being exploited?

CVE-2016-20045 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-2016-20045 affect?

CVE-2016-20045 affects hierarchical notebook. Severity is high (CVSS 8.4). HNB Organizer 1.9.18-10 contains a local buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying an oversized argument to the -rc command-line parameter. Attackers can craft a malicious input string

Q: How urgent is CVE-2016-20045?

Priority 37/100. High severity; Public exploit reference

Routine

HIGH 8.4UPGRADE

CVE-2016-20045 is a high-severity flaw (CVSS 8.4) affecting hierarchical notebook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HNB Organizer 1.9.18-10 contains a local buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying an oversized argument to the -rc command-line parameter. Attackers can craft a malicious input string exceeding 108 bytes containing shellcode and a return address to overwrite the stack and achieve code execution.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-03-28
Last modified	2026-10-07

Publisher (CNA): VulnCheck · Vendor: hnb project

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-28 12:16 UTCPublished CVE record published
2026-10-07 08:10 UTCUpdated Record last modified

hnb project hierarchical notebook UPGRADE

Affected: <= 1.9.18-10

Fixed in: newer than 1.9.18-10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hierarchical-notebook || rpm -q hierarchical-notebook || hierarchical-notebook --version

2. UPGRADE to newer than 1.9.18-10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hierarchical-notebook

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hierarchical-notebook

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-2016-20045?

hierarchical notebook: upgrade to newer than 1.9.18-10. Exact commands for each OS are on this page.

Is CVE-2016-20045 being exploited?

CVE-2016-20045 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-2016-20045 affect?

CVE-2016-20045 affects hierarchical notebook. Severity is high (CVSS 8.4). HNB Organizer 1.9.18-10 contains a local buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying an oversized argument to the -rc command-line parameter. Attackers can craft a malicious input string

How urgent is CVE-2016-20045?

Priority 37/100. High severity; Public exploit reference

References

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