How severe is CVE-2016-1991?

CVE-2016-1991 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-1991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1991?

CVE-2016-1991 primarily affects Microfocus Arcsight Enterprise Security Manager. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-1991?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-1991 published?

CVE-2016-1991 was published on 2016-03-16 and last updated on 2026-06-17.

CVE-2016-1991

CVE-2016-1991 is a high-severity vulnerability in Microfocus Arcsight Enterprise Security Manager with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.0)
CVSS v2: 6.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microfocus Arcsight Enterprise Security Manager
Published: 2016-03-16
Last modified: 2026-06-17

Description

HPE ArcSight ESM 5.x before 5.6, 6.0, 6.5.x before 6.5C SP1 Patch 2, and 6.8c before P1, and ArcSight ESM Express before 6.9.1, allows remote authenticated users to conduct unspecified "file download" attacks via unknown vectors.

Frequently asked questions

What is CVE-2016-1991?: HPE ArcSight ESM 5.x before 5.6, 6.0, 6.5.x before 6.5C SP1 Patch 2, and 6.8c before P1, and ArcSight ESM Express before 6.9.1, allows remote authenticated users to conduct unspecified "file download" attacks via unknown vectors.
How severe is CVE-2016-1991?: CVE-2016-1991 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-1991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1991?: CVE-2016-1991 primarily affects Microfocus Arcsight Enterprise Security Manager. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-1991?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-1991 published?: CVE-2016-1991 was published on 2016-03-16 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:microfocus:arcsight_enterprise_security_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:microfocus:arcsight_enterprise_security_manager:6.0:*:*:*:*:*:*:*
cpe:2.3:a:microfocus:arcsight_enterprise_security_manager:6.5:*:*:*:*:*:*:*
cpe:2.3:a:microfocus:arcsight_enterprise_security_manager:6.8:*:*:*:*:*:*:*
cpe:2.3:a:microfocus:arcsight_enterprise_security_manager:6.9:*:*:*:express:*:*:*

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