CVE-2022-29777
Published: 02 June 2022
Summary
CVE-2022-29777 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Onlyoffice Core. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 5.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
Onlyoffice Document Server versions 6.0.0 and earlier, along with Core versions 6.1.0.26 and earlier, contain a heap overflow vulnerability in the DesktopEditor/fontengine/fontconverter/FontFileBase.h component. The flaw is tracked as CWE-787 and carries a CVSS 3.1 score of 9.8, reflecting network-accessible out-of-bounds write conditions that require no authentication or user interaction.
An unauthenticated remote attacker can supply a malicious font file to the affected document-processing service, triggering the overflow to corrupt heap memory and potentially execute arbitrary code, read sensitive data, or cause a denial of service. Public proof-of-concept code demonstrating exploitation has been published.
Vendor changelogs and the referenced commit b17d5e860f30e8be2caeb0022b63be4c76660178 indicate that the issue was addressed in subsequent releases; administrators should upgrade Document Server to version 6.0.1 or later and Core to a patched build to eliminate the vulnerable font-handling code path. The EPSS score has remained flat at 0.1616 with no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-34098
Vulnerability details
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.