CVE-2020-13432: rejetto HFS (aka HTTP File Server) v2.3m Build #300, when virtual files or folders are used, allows remote att

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-13432 is a high-severity flaw (CVSS 7.5) affecting http file server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rejetto HFS (aka HTTP File Server) v2.3m Build #300, when virtual files or folders are used, allows remote attackers to trigger an invalid-pointer write access violation via concurrent HTTP requests with a long URI or long HTTP headers.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
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	30.9% (top 2%)
CISA exploited list	No
Weakness	CWE-120
Published	2020-06-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rejetto

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

Am I affected?

Timeline

2020-06-08 18:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

rejetto http file server DOWNGRADE

Affected: 2.3m

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3m

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.3m (Debian / Ubuntu)

apt-cache madison http-file-server sudo apt install http-file-server=<VERSION_BEFORE_2.3m> sudo apt-mark hold http-file-server

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

dnf --showduplicates list http-file-server sudo dnf downgrade http-file-server-<VERSION_BEFORE_2.3m> sudo dnf versionlock add http-file-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-2020-13432?

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

Is CVE-2020-13432 being exploited?

CVE-2020-13432 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-2020-13432 affect?

CVE-2020-13432 affects http file server. Severity is high (CVSS 7.5). rejetto HFS (aka HTTP File Server) v2.3m Build #300, when virtual files or folders are used, allows remote attackers to trigger an invalid-pointer write access violation via concurrent HTTP requests with a long URI or long HTTP headers.

How urgent is CVE-2020-13432?

Priority 61/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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References

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