CVE-2020-13583: A denial-of-service vulnerability exists in the HTTP Server functionality of Micrium uC-HTTP 3.01.00

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2020-13583 is a high-severity flaw (CVSS 7.5) affecting uc-http. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A denial-of-service vulnerability exists in the HTTP Server functionality of Micrium uC-HTTP 3.01.00. A specially crafted HTTP request can lead to denial of service. An attacker can send an HTTP request to trigger this vulnerability.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-476
Published	2021-02-10
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: micrium

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

Am I affected?

Timeline

2021-02-10 22:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

micrium uc-http DOWNGRADE

Affected: 3.01.00

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.01.00

1. Check installed version

apt-cache policy uc-http || rpm -q uc-http || uc-http --version

2. No fixed release: DOWNGRADE to a release before 3.01.00 (Debian / Ubuntu)

apt-cache madison uc-http sudo apt install uc-http=<VERSION_BEFORE_3.01.00> sudo apt-mark hold uc-http

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

dnf --showduplicates list uc-http sudo dnf downgrade uc-http-<VERSION_BEFORE_3.01.00> sudo dnf versionlock add uc-http

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-2020-13583?

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

Is CVE-2020-13583 being exploited?

CVE-2020-13583 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-2020-13583 affect?

CVE-2020-13583 affects uc-http. Severity is high (CVSS 7.5). A denial-of-service vulnerability exists in the HTTP Server functionality of Micrium uC-HTTP 3.01.00. A specially crafted HTTP request can lead to denial of service. An attacker can send an HTTP request to trigger this vulnerability.

How urgent is CVE-2020-13583?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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