VulnerabilityModified

CVE-2016-3644

EXPLOIT ✓HIGH 8.4EPSS 17.7%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 17.7%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.

Description

The AntiVirus Decomposer engine in Symantec Advanced Threat Protection (ATP); Symantec Data Center Security:Server (SDCS:S) 6.x through 6.6 MP1; Symantec Web Gateway; Symantec Endpoint Protection (SEP) before 12.1 RU6 MP5; Symantec Endpoint Protection (SEP) for Mac; Symantec Endpoint Protection (SEP) for Linux before 12.1 RU6 MP5; Symantec Protection Engine (SPE) before 7.0.5 HF01, 7.5.x before 7.5.3 HF03, 7.5.4 before HF01, and 7.8.0 before HF01; Symantec Protection for SharePoint Servers (SPSS) 6.0.3 through 6.0.5 before 6.0.5 HF 1.5 and 6.0.6 before HF 1.6; Symantec Mail Security for Microsoft Exchange (SMSMSE) before 7.0_3966002 HF1.1 and 7.5.x before 7.5_3966008 VHF1.2; Symantec Mail Security for Domino (SMSDOM) before 8.0.9 HF1.1 and 8.1.x before 8.1.3 HF1.2; CSAPI before 10.0.4 HF01; Symantec Message Gateway (SMG) before 10.6.1-4; Symantec Message Gateway for Service Providers (SMG-SP) 10.5 before patch 254 and 10.6 before patch 253; Norton AntiVirus, Norton Security, Norton Internet Security, and Norton 360 before NGC 22.7; Norton Security for Mac before 13.0.2; Norton Power Eraser (NPE) before 5.1; and Norton Bootable Removal Tool (NBRT) before 2016.1 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via modified MIME data in a message.

CVSS 3.0: 8.4 HIGHCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 17.74% probability · 97th percentile
Public exploits: 1 in Exploit-DB · verified · first 29 June 2016
CISA KEV: Not listed
Weakness: CWE-20
Affected: symantec/norton security · symantec/protection engine · symantec/advanced threat protection · symantec/norton bootable removal tool · symantec/data center security server · symantec/protection for sharepoint servers · symantec/message gateway for service providers · symantec/csapi · symantec/endpoint protection · symantec/norton power eraser · symantec/mail security for domino · symantec/mail security for microsoft exchange · symantec/message gateway · symantec/norton 360 · symantec/norton antivirus · symantec/norton internet security · symantec/norton security with backup · symantec/ngc
Source: secure@symantec.com

EPSS trend

EPSS moved from 21.7% on 21 September 2026 to 17.7% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

Public exploits (1)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-ID	Title	Type	Published	Verified
EDB-40034 source ↗	Symantec AntiVirus - Heap Overflow Modifying MIME Messagesmultiple · Google Security Research	dos	29 June 2016	yes

References

http://www.securityfocus.com/bid/91431Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036198Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036199Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/40034/Third Party Advisory, VDB Entry
https://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=&suid=20160628_00Vendor Advisory
http://www.securityfocus.com/bid/91431Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036198Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036199Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/40034/Third Party Advisory, VDB Entry
https://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=&suid=20160628_00Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.