CVE-2020-29596: MiniWeb HTTP server 0.8.19 allows remote attackers to cause a denial of service (daemon crash) via a long name

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-29596 is a high-severity flaw (CVSS 7.5) affecting miniweb http server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MiniWeb HTTP server 0.8.19 allows remote attackers to cause a denial of service (daemon crash) via a long name for the first parameter in a POST request.

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	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-120
Published	2020-12-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: miniweb http server project

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

Am I affected?

Timeline

2020-12-21 22:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

miniweb http server project miniweb http server DOWNGRADE

Affected: 0.8.19

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.8.19

1. Check installed version

apt-cache policy miniweb-http-server || rpm -q miniweb-http-server || miniweb-http-server --version

2. No fixed release: DOWNGRADE to a release before 0.8.19 (Debian / Ubuntu)

apt-cache madison miniweb-http-server sudo apt install miniweb-http-server=<VERSION_BEFORE_0.8.19> sudo apt-mark hold miniweb-http-server

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

dnf --showduplicates list miniweb-http-server sudo dnf downgrade miniweb-http-server-<VERSION_BEFORE_0.8.19> sudo dnf versionlock add miniweb-http-server

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-2020-29596?

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

Is CVE-2020-29596 being exploited?

CVE-2020-29596 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-2020-29596 affect?

CVE-2020-29596 affects miniweb http server. Severity is high (CVSS 7.5). MiniWeb HTTP server 0.8.19 allows remote attackers to cause a denial of service (daemon crash) via a long name for the first parameter in a POST request.

How urgent is CVE-2020-29596?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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