CVE-2020-8202: Improper check of inputs in Nextcloud Preferred Providers app v1.6.0 allowed to perform a denial of service at

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2020-8202 is a medium-severity flaw (CVSS 5.3) affecting preferred providers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper check of inputs in Nextcloud Preferred Providers app v1.6.0 allowed to perform a denial of service attack when using a very long password.

Why this priority

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	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-307
Published	2020-07-30
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: nextcloud

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

Am I affected?

Timeline

2020-07-30 13:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

nextcloud preferred providers DOWNGRADE

Affected: 1.6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6.0

1. Check installed version

apt-cache policy preferred-providers || rpm -q preferred-providers || preferred-providers --version

2. No fixed release: DOWNGRADE to a release before 1.6.0 (Debian / Ubuntu)

apt-cache madison preferred-providers sudo apt install preferred-providers=<VERSION_BEFORE_1.6.0> sudo apt-mark hold preferred-providers

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

dnf --showduplicates list preferred-providers sudo dnf downgrade preferred-providers-<VERSION_BEFORE_1.6.0> sudo dnf versionlock add preferred-providers

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-2020-8202?

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

Is CVE-2020-8202 being exploited?

CVE-2020-8202 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-2020-8202 affect?

CVE-2020-8202 affects preferred providers. Severity is medium (CVSS 5.3). Improper check of inputs in Nextcloud Preferred Providers app v1.6.0 allowed to perform a denial of service attack when using a very long password.

How urgent is CVE-2020-8202?

Priority 46/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Nextcloud vulnerabilities

Related CVEs

CVE-2020-8228 MEDIUM 5.3 DOWNGRADE DOWNGRADE A missing rate limit in the Preferred Providers app 1.7.0 allowed an attacker to set the password an uncontrol

References

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