CVE-2021-36711: WebInterface in OctoBot before 0.4.4 allows remote code execution because Tentacles upload is mishandled.

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-36711 is a critical-severity flaw (CVSS 9.8) affecting octobot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WebInterface in OctoBot before 0.4.4 allows remote code execution because Tentacles upload is mishandled.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	16.6% (top 3%)
CISA exploited list	No
Weakness	CWE-434
Published	2022-07-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: octobot

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

Am I affected?

Timeline

2022-07-16 17:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

octobot octobot UPGRADE

Affected: < 0.4.4

Fixed in: 0.4.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.4.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade octobot

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade octobot

Note

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

Exact fixes by distribution

Python (pip) · OctoBot · FIXED · 0.4.4 · vulnerable: < 0.4.4 · source

pip install --upgrade "OctoBot>=0.4.4" pip show OctoBot

Fedora ELN · luksmeta · FIXED · 11-3.eln159 · FEDORA-2026-5176083b78 · source

sudo dnf upgrade --advisory=FEDORA-2026-5176083b78

Fedora 46 · openscad · FIXED · 2021.01-34.fc46 · FEDORA-2026-faf1721128 · source

sudo dnf upgrade --advisory=FEDORA-2026-faf1721128

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/Drakkar-Software/OctoBot/issues/1966
Write-up: github.com/Nwqda/Sashimi-Evil-OctoBot-Tentacle
Write-up: packetstormsecurity.com/files/167721/Sashimi-Evil-OctoBot-Tentacle.html
Exploit-DB: OctoBot WebInterface 0.4.3 - Remote Code Execution (RCE)

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-2021-36711?

octobot: upgrade to 0.4.4. Exact commands for each OS are on this page.

Is CVE-2021-36711 being exploited?

CVE-2021-36711 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-2021-36711 affect?

CVE-2021-36711 affects octobot. Severity is critical (CVSS 9.8). WebInterface in OctoBot before 0.4.4 allows remote code execution because Tentacles upload is mishandled.

How urgent is CVE-2021-36711?

Priority 69/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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