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CVE-2016-5309

33
FAUCET Score

CVE-2016-5309 describes an out-of-bounds read vulnerability in the RAR file parser component of various Symantec AntiVirus Decomposer engines. This flaw affects numerous Symantec products, including several versions of Endpoint Protection, Mail Security, Protection Engine, and Messaging Gateway. The vulnerability has a CVSS score of 5.5 (Medium), indicating a low attack complexity and requiring user interaction (e.g., opening a malicious RAR file) to trigger a denial of service. While there is no evidence of active exploitation, an exploit (EDB-40405) exists on ExploitDB for both out-of-bounds read and write, and there is no significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:broadcom:symantec_data_center_security_server:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:symantec:advanced_threat_protection:-:*:*:*:*:*:*:*
<= 10.0.4CPE matchmatch criteria
cpe:2.3:a:symantec:csapi:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:symantec:email_security.cloud:-:*:*:*:*:*:*:*
<= 12.1.4CPE matchmatch criteria
cpe:2.3:a:symantec:endpoint_protection:*:*:*:*:*:mac:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.88%
Probability of exploitation in next 30 days
EPSS Percentile
93.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
ExploitDB: EDB-40405 · Sep 21, 2016
This CVE's current EPSS score of 0.0688 is in the 98th percentile among its peer group of 5,758 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

bugs.chromium.org / p/project-zero/issues/detail
ExploitPatchThird Party Advisory
exploit-db.com / exploits/40405
ExploitThird Party AdvisoryVDB Entry
symantec.com / security_response/securityupdates/detail.jsp
Vendor Advisory
securityfocus.com / bid/92868
Third Party AdvisoryVDB Entry
securitytracker.com / id/1036847
Third Party AdvisoryVDB Entry
securitytracker.com / id/1036848
Third Party AdvisoryVDB Entry
securitytracker.com / id/1036849
Third Party AdvisoryVDB Entry
securitytracker.com / id/1036850
Third Party AdvisoryVDB Entry