CVE-2020-27868: This vulnerability allows remote attackers to execute arbitrary code on affected installations of Qognify Ocul

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-27868 is a critical-severity flaw (CVSS 9.8) affecting ocularis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Qognify Ocularis 5.9.0.395. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of serialized objects provided to the EventCoordinator endpoint. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can lever

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	81.8% (top 1%)
CISA exploited list	No
Weakness	CWE-502
Published	2021-02-12
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: qognify

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

Am I affected?

Timeline

2021-02-12 00:15 UTCPublished CVE record published
2026-06-17 03:09 UTCUpdated Record last modified

qognify ocularis DOWNGRADE

Affected: 5.9.0.395

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.9.0.395

1. Check installed version

apt-cache policy ocularis || rpm -q ocularis || ocularis --version

2. No fixed release: DOWNGRADE to a release before 5.9.0.395 (Debian / Ubuntu)

apt-cache madison ocularis sudo apt install ocularis=<VERSION_BEFORE_5.9.0.395> sudo apt-mark hold ocularis

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

dnf --showduplicates list ocularis sudo dnf downgrade ocularis-<VERSION_BEFORE_5.9.0.395> sudo dnf versionlock add ocularis

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-2020-27868?

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

Is CVE-2020-27868 being exploited?

CVE-2020-27868 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-2020-27868 affect?

CVE-2020-27868 affects ocularis. Severity is critical (CVSS 9.8). This vulnerability allows remote attackers to execute arbitrary code on affected installations of Qognify Ocularis 5.9.0.395. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of seri

How urgent is CVE-2020-27868?

Priority 64/100. Critical severity; EPSS top 1%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-3852 HIGH 7.5 DOWNGRADE An exploitable denial of service vulnerability exists in the Ocularis Recorder functionality of Ocularis 5.5.0

References

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