CVE-2022-29777: Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a heap over

Q: How do I fix CVE-2022-29777?

core: upgrade to newer than 6.1.0.26; document server: upgrade to newer than 6.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2022-29777 being exploited?

CVE-2022-29777 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-29777 affect?

CVE-2022-29777 affects core, document server. Severity is critical (CVSS 9.8). Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a heap overflow via the component DesktopEditor/fontengine/fontconverter/FontFileBase.h.

Q: How urgent is CVE-2022-29777?

Priority 68/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2022-29777 is a critical-severity flaw (CVSS 9.8) affecting core, document server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a heap overflow via the component DesktopEditor/fontengine/fontconverter/FontFileBase.h.

Why this priority

Critical severity
EPSS top 6%: 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	7.0% (top 6%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-06-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: onlyoffice

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

Am I affected?

Timeline

2022-06-02 14:15 UTCPublished CVE record published
2026-06-17 04:40 UTCUpdated Record last modified

onlyoffice core UPGRADE

Affected: <= 6.1.0.26

Fixed in: newer than 6.1.0.26

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 6.1.0.26 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade core

Note

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

onlyoffice document server UPGRADE

Affected: <= 6.0.0

Fixed in: newer than 6.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 6.0.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade document-server

Note

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

Exact fixes by distribution

Fedora 46 · iodine · FIXED · 0.9.0-2.fc46 · FEDORA-2026-4448545972 · source

sudo dnf upgrade --advisory=FEDORA-2026-4448545972

Fedora ELN · python-idna · FIXED · 3.20-1.eln159 · FEDORA-2026-4421e6642f · source

sudo dnf upgrade --advisory=FEDORA-2026-4421e6642f

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/moehw/poc_exploits/tree/master/CVE-2022-29777

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-2022-29777?

core: upgrade to newer than 6.1.0.26; document server: upgrade to newer than 6.0.0. Exact commands for each OS are on this page.

Is CVE-2022-29777 being exploited?

CVE-2022-29777 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-2022-29777 affect?

CVE-2022-29777 affects core, document server. Severity is critical (CVSS 9.8). Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a heap overflow via the component DesktopEditor/fontengine/fontconverter/FontFileBase.h.

How urgent is CVE-2022-29777?

Priority 68/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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References

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