CVE-2006-0353: unix_random.c in lshd for lsh 2.0.1 leaks file descriptors related to the randomness generator, which allows l

Routine

LOW 3.6WATCHLISTDOWNGRADE

CVE-2006-0353 is a low-severity flaw (CVSS 3.6) affecting lsh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

unix_random.c in lshd for lsh 2.0.1 leaks file descriptors related to the randomness generator, which allows local users to cause a denial of service by truncating the seed file, which prevents the server from starting, or obtain sensitive seed information that could be used to crack keys.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	3.6 (Low)
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-200
Published	2006-01-22
Last modified	2026-06-16

Publisher (CNA): Debian GNU/Linux · Vendor: gnu

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-01-22 19:03 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

gnu lsh DOWNGRADE

Affected: 2.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.1 (Debian / Ubuntu)

apt-cache madison lsh sudo apt install lsh=<VERSION_BEFORE_2.0.1> sudo apt-mark hold lsh

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list lsh sudo dnf downgrade lsh-<VERSION_BEFORE_2.0.1> sudo dnf versionlock add lsh

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2006-0353?

lsh: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0353 being exploited?

CVE-2006-0353 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-2006-0353 affect?

CVE-2006-0353 affects lsh. Severity is low (CVSS 3.6). unix_random.c in lshd for lsh 2.0.1 leaks file descriptors related to the randomness generator, which allows local users to cause a denial of service by truncating the seed file, which prevents the server from starting, or obtain sensitive

How urgent is CVE-2006-0353?

Priority 25/100. On your watchlist

Related CVEs

CVE-2005-0814 MEDIUM 5.0 DOWNGRADE Unknown vulnerability in lshd in Lysator LSH 1.x and 2.x before 2.0.1 allows remote attackers to cause a denia
CVE-2003-0826 HIGH 7.5 DOWNGRADE lsh daemon (lshd) does not properly return from certain functions in (1) read_line.c, (2) channel_commands.c,

References

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