CVE-2020-24335: An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG

Q: How do I fix CVE-2020-24335?

uip: upgrade to newer than 1.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-24335 being exploited?

CVE-2020-24335 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-2020-24335 affect?

CVE-2020-24335 affects uip. Severity is high (CVSS 7.5). An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG. Domain name parsing lacks bounds checks, allowing an attacker to corrupt memory with crafted DNS packets.

Q: How urgent is CVE-2020-24335?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2020-24335 is a high-severity flaw (CVSS 7.5) affecting uip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG. Domain name parsing lacks bounds checks, allowing an attacker to corrupt memory with crafted DNS packets.

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	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-125
Published	2021-02-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: uip project

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

Am I affected?

Timeline

2021-02-02 07:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

uip project uip UPGRADE

Affected: <= 1.0

Fixed in: newer than 1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade uip

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-2020-24335?

uip: upgrade to newer than 1.0. Exact commands for each OS are on this page.

Is CVE-2020-24335 being exploited?

CVE-2020-24335 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-2020-24335 affect?

CVE-2020-24335 affects uip. Severity is high (CVSS 7.5). An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG. Domain name parsing lacks bounds checks, allowing an attacker to corrupt memory with crafted DNS packets.

How urgent is CVE-2020-24335?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-24334 HIGH 8.2 UPGRADE The code that processes DNS responses in uIP through 1.0, as used in Contiki and Contiki-NG, does not check wh
CVE-2020-17440 HIGH 7.5 DOWNGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products
CVE-2020-17439 HIGH 8.3 DOWNGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products
CVE-2020-17438 CRITICAL 9.8 DOWNGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products
CVE-2020-17437 HIGH 8.2 UPGRADE UPGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products

References

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