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CVE Record

CVE-2019-1855: Cisco Jabber for Windows DLL Preloading Vulnerability

A vulnerability in the loading mechanism of specific dynamic link libraries in Cisco Jabber for Windows could allow an authenticated, local attacker to perform a DLL preloading attack. To exploit this vulnerability, the attacker would need to have valid credentials on the Windows system. The vulnerability is due to insufficient validation of the resources loaded by the application at run time. An attacker could exploit this vulnerability by crafting a malicious DLL file and placing it in a specific location on the targeted system. The malicious DLL file would execute when the Jabber application launches. A successful exploit could allow the attacker to execute arbitrary code on the target machine with the privileges of another user's account.

HighCVSS 7.3Not KEV-listedUpdated
Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2019-1855 affects Cisco Jabber for Windows. A logged-in local attacker could abuse how Jabber loads DLL files so malicious code runs when another user launches Jabber. This is not a remote internet attack, but it can matter on shared, compromised, or weakly controlled Windows endpoints. Exposure is limited to Windows endpoints running Cisco Jabber for Windows. Risk is highest where attackers may already have local credentials, where endpoints are shared, or where users can write files into locations searched by applications at launch. Prioritize remediation where Jabber is deployed on shared Windows systems or used by privileged staff. The business risk is endpoint code execution after an attacker already has local credentials, so this should be handled in standard endpoint patching and hardening cycles unless sensitive systems are affected. Mitigation focus: Identify all endpoints running Cisco Jabber for Windows.; Check Cisco’s advisory for fixed versions and vendor remediation guidance.; Update or remove vulnerable Jabber installations where applicable..

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Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2019-1855 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.3 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.3CVSS 3.0HighCVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H1.35.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

7.3High
CVSS 3.0 vector shape for CVE-2019-1855Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Jabber for WindowsunspecifiedListed
Weakness

CWE details

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CWE-264 · source CWE mapping

Permissions, Privileges, and Access Controls

Permissions, Privileges, and Access Controls represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.