CVE-2021-25829 : An improper binary stream data handling issue was found in the [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.

An improper binary stream data handling issue was found in the [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3. Using this bug, an attacker is able to produce a denial of service attack that can eventually shut down the target server.

Published 2021-03-01 16:15:14

Updated 2021-03-05 19:50:14

Source MITRE

View at NVD, CVE.org

Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2021-25829

EPSS FAQ

0.95%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 81 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-25829

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.8	HIGH	AV:N/AC:L/Au:N/C:N/I:N/A:C	10.0	6.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

References for CVE-2021-25829

https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/NotesSlide.h#L141

core/NotesSlide.h at c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a · ONLYOFFICE/core · GitHub
Vendor Advisory
https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Theme.h#L277

core/Theme.h at c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a · ONLYOFFICE/core · GitHub
Vendor Advisory
https://github.com/ONLYOFFICE/DocumentServer

GitHub - ONLYOFFICE/DocumentServer: ONLYOFFICE Document Server is an online office suite comprising viewers and editors for texts, spreadsheets and presentations, fully compatible with Office Open XML
Product

CVEs referencing this url
https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25829

poc_exploits/ONLYOFFICE/CVE-2021-25829 at master · merrychap/poc_exploits · GitHub
Exploit;Third Party Advisory
https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/NotesMaster.h#L148

core/NotesMaster.h at c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a · ONLYOFFICE/core · GitHub
Vendor Advisory
https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Presentation.h#L277

core/Presentation.h at c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a · ONLYOFFICE/core · GitHub
Vendor Advisory
https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Core.h#L161

core/Core.h at c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a · ONLYOFFICE/core · GitHub
Vendor Advisory
https://github.com/ONLYOFFICE/core

GitHub - ONLYOFFICE/core: Server core components which are a part of ONLYOFFICE Document Server
Product;Vendor Advisory

CVEs referencing this url
https://github.com/ONLYOFFICE/core/blob/v5.6.4.10/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1722

core/BinaryFileReaderWriter.cpp at v5.6.4.10 · ONLYOFFICE/core · GitHub
Vendor Advisory
https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Comments.h#L299

core/Comments.h at c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a · ONLYOFFICE/core · GitHub
Vendor Advisory

Products affected by CVE-2021-25829

Onlyoffice » Document Server
Versions from including (>=) 4.0.0-9 and up to, including, (<=) 5.6.3
cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:*
Matching versions

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Vulnerability Details : CVE-2021-25829

Exploit prediction scoring system (EPSS) score for CVE-2021-25829

CVSS scores for CVE-2021-25829

References for CVE-2021-25829

Products affected by CVE-2021-25829