CVE-2020-36252: ownCloud Server 10.x before 10.3.1 allows an attacker, who has one outgoing share from a victim, to access any

Routine

MEDIUM 6.8UPGRADE

CVE-2020-36252 is a medium-severity flaw (CVSS 6.8) affecting owncloud server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ownCloud Server 10.x before 10.3.1 allows an attacker, who has one outgoing share from a victim, to access any version of any file by sending a request for a predictable ID number.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-330
Published	2021-02-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: owncloud

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

Am I affected?

Timeline

2021-02-19 07:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

owncloud owncloud server UPGRADE

Affected: >= 10.0.9 and < 10.3.1

Fixed in: 10.3.1

Safe to downgrade to: a release before 10.0.9

1. Check installed version

apt-cache policy owncloud-server || rpm -q owncloud-server || owncloud-server --version

2. UPGRADE to 10.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade owncloud-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade owncloud-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.0.9 (Debian / Ubuntu)

apt-cache madison owncloud-server sudo apt install owncloud-server=<VERSION_BEFORE_10.0.9> sudo apt-mark hold owncloud-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list owncloud-server sudo dnf downgrade owncloud-server-<VERSION_BEFORE_10.0.9> sudo dnf versionlock add owncloud-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-2020-36252?

owncloud server: upgrade to 10.3.1. Exact commands for each OS are on this page.

Is CVE-2020-36252 being exploited?

CVE-2020-36252 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-2020-36252 affect?

CVE-2020-36252 affects owncloud server. Severity is medium (CVSS 6.8). ownCloud Server 10.x before 10.3.1 allows an attacker, who has one outgoing share from a victim, to access any version of any file by sending a request for a predictable ID number.

How urgent is CVE-2020-36252?

Priority 35/100. No elevated risk signals yet.

Software pages

ownCloud vulnerabilities

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References

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