How severe is CVE-2016-5309?

CVE-2016-5309 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-5309 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5309?

CVE-2016-5309 primarily affects Symantec Advanced Threat Protection. In total, 43 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-5309?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-5309 published?

CVE-2016-5309 was published on 2017-04-14 and last updated on 2026-06-17.

CVE-2016-5309

CVE-2016-5309 is a medium-severity vulnerability in Symantec Advanced Threat Protection with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Symantec Advanced Threat Protection
Published: 2017-04-14
Last modified: 2026-06-17

Description

The RAR file parser component in the AntiVirus Decomposer engine in Symantec Advanced Threat Protection: Network (ATP); Symantec Email Security.Cloud; Symantec Data Center Security: Server; Symantec Endpoint Protection (SEP) for Windows before 12.1.6 MP5; Symantec Endpoint Protection (SEP) for Mac; Symantec Endpoint Protection (SEP) for Linux before 12.1.6 MP6; Symantec Endpoint Protection for Small Business Enterprise (SEP SBE/SEP.Cloud); Symantec Endpoint Protection Cloud (SEPC) for Windows/Mac; Symantec Endpoint Protection Small Business Edition 12.1; CSAPI before 10.0.4 HF02; Symantec Protection Engine (SPE) before 7.0.5 HF02, 7.5.x before 7.5.4 HF02, 7.5.5 before 7.5.5 HF01, and 7.8.x before 7.8.0 HF03; Symantec Mail Security for Domino (SMSDOM) before 8.0.9 HF2.1, 8.1.x before 8.1.2 HF2.3, and 8.1.3 before 8.1.3 HF2.2; Symantec Mail Security for Microsoft Exchange (SMSMSE) before 6.5.8_3968140 HF2.3, 7.x before 7.0_3966002 HF2.1, and 7.5.x before 7.5_3966008 VHF2.2; Symantec Protection for SharePoint Servers (SPSS) before SPSS_6.0.3_To_6.0.5_HF_2.5 update, 6.0.6 before 6.0.6 HF_2.6, and 6.0.7 before 6.0.7_HF_2.7; Symantec Messaging Gateway (SMG) before 10.6.2; Symantec Messaging Gateway for Service Providers (SMG-SP) before 10.5 patch 260 and 10.6 before patch 259; Symantec Web Gateway; and Symantec Web Security.Cloud allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted RAR file that is mishandled during decompression.

Frequently asked questions

What is CVE-2016-5309?: The RAR file parser component in the AntiVirus Decomposer engine in Symantec Advanced Threat Protection: Network (ATP); Symantec Email Security.Cloud; Symantec Data Center Security: Server; Symantec Endpoint Protection (SEP) for Windows before 12.1.6 MP5; Symantec Endpoint Protection (SEP) for Mac; Symantec Endpoint Protection (SEP) for Linux before 12.1.6 MP6; Symantec Endpoint Protection for Small Business Enterprise (SEP SBE/SEP.Cloud); Symantec Endpoint Protection Cloud (SEPC) for Windows/Mac; Symantec Endpoint Protection Small Business Edition 12.1; CSAPI before 10.0.4 HF02; Symantec Protection Engine (SPE) before 7.0.5 HF02, 7.5.x before 7.5.4 HF02, 7.5.5 before 7.5.5 HF01, and 7.8.x before 7.8.0 HF03; Symantec Mail Security for Domino (SMSDOM) before 8.0.9 HF2.1, 8.1.x before 8.1.2 HF2.3, and 8.1.3 before 8.1.3 HF2.2; Symantec Mail Security for Microsoft Exchange (SMSMSE) before 6.5.8_3968140 HF2.3, 7.x before 7.0_3966002 HF2.1, and 7.5.x before 7.5_3966008 VHF2.2; Symantec Protection for SharePoint Servers (SPSS) before SPSS_6.0.3_To_6.0.5_HF_2.5 update, 6.0.6 before 6.0.6 HF_2.6, and 6.0.7 before 6.0.7_HF_2.7; Symantec Messaging Gateway (SMG) before 10.6.2; Symantec Messaging Gateway for Service Providers (SMG-SP) before 10.5 patch 260 and 10.6 before patch 259; Symantec Web Gateway; and Symantec Web Security.Cloud allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted RAR file that is mishandled during decompression.
How severe is CVE-2016-5309?: CVE-2016-5309 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-5309 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5309?: CVE-2016-5309 primarily affects Symantec Advanced Threat Protection. In total, 43 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-5309?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-5309 published?: CVE-2016-5309 was published on 2017-04-14 and last updated on 2026-06-17.

References

Affected products (43)

cpe:2.3:a:broadcom:symantec_data_center_security_server:-:*:*:*:*:*:*:*
cpe:2.3:a:symantec:advanced_threat_protection:-:*:*:*:*:*:*:*
cpe:2.3:a:symantec:csapi:*:*:*:*:*:*:*:*
cpe:2.3:a:symantec:email_security.cloud:-:*:*:*:*:*:*:*
cpe:2.3:a:symantec:endpoint_protection:*:*:*:*:*:mac:*:*
cpe:2.3:a:symantec:endpoint_protection:*:*:*:*:*:linux:*:*
cpe:2.3:a:symantec:endpoint_protection:*:*:*:*:*:windows:*:*
cpe:2.3:a:symantec:endpoint_protection_cloud:-:*:*:*:*:mac:*:*
cpe:2.3:a:symantec:endpoint_protection_cloud:-:*:*:*:*:windows:*:*
cpe:2.3:a:symantec:endpoint_protection_for_small_business:*:*:*:*:*:*:*:*
cpe:2.3:a:symantec:endpoint_protection_for_small_business:-:*:*:*:enterprise:*:*:*
cpe:2.3:a:symantec:mail_security_for_domino:*:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_domino:8.1.2:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_domino:8.1.3:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:*:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.0:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.0.1:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.0.2:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.0.3:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.0.4:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.5:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.5.1:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.5.2:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.5.3:*:*:*:*:*:*:*
cpe:2.3:a:symantec:mail_security_for_microsoft_exchange:7.5.4:*:*:*:*:*:*:*
cpe:2.3:a:symantec:messaging_gateway:*:*:*:*:*:*:*:*
cpe:2.3:a:symantec:messaging_gateway_for_service_providers:10.5:*:*:*:*:*:*:*
cpe:2.3:a:symantec:messaging_gateway_for_service_providers:10.6:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:*:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:7.5.0:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:7.5.1:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:7.5.2:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:7.5.3:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:7.5.4:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:7.5.5:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_engine:7.8.0:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_for_sharepoint_servers:6.0.3:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_for_sharepoint_servers:6.0.4:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_for_sharepoint_servers:6.0.5:*:*:*:*:*:*:*
cpe:2.3:a:symantec:protection_for_sharepoint_servers:6.0.6:*:*:*:*:*:*:*

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