CVE-2002-2124: The recvn and sendn functions in nylon 0.2 do not check when the recv function call returns 0, which allows re

Routine

MEDIUM 5.0DOWNGRADE

CVE-2002-2124 is a medium-severity flaw (CVSS 5.0) affecting nylon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The recvn and sendn functions in nylon 0.2 do not check when the recv function call returns 0, which allows remote attackers to cause a denial of service (infinite loop and CPU consumption) by closing the connection while recv is executing.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nylon

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

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

nylon nylon DOWNGRADE

Affected: 0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.2 (Debian / Ubuntu)

apt-cache madison nylon sudo apt install nylon=<VERSION_BEFORE_0.2> sudo apt-mark hold nylon

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

dnf --showduplicates list nylon sudo dnf downgrade nylon-<VERSION_BEFORE_0.2> sudo dnf versionlock add nylon

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-2002-2124?

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

Is CVE-2002-2124 being exploited?

CVE-2002-2124 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-2002-2124 affect?

CVE-2002-2124 affects nylon. Severity is medium (CVSS 5.0). The recvn and sendn functions in nylon 0.2 do not check when the recv function call returns 0, which allows remote attackers to cause a denial of service (infinite loop and CPU consumption) by closing the connection while recv is executing.

How urgent is CVE-2002-2124?

Priority 36/100. No elevated risk signals yet.

References

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