Security readout for executives and security teams
Plain-English summary
CVE-2019-5631 lets a low-privileged local user on a machine running the Rapid7 InsightAppSec broker potentially gain the broker’s privileges, usually SYSTEM. This is not described as remote exploitation, but it can turn a foothold on a Windows host into full local control.
Executive priority
Treat this as a high-priority maintenance and hardening item for any affected broker host. It is less urgent than a remotely exploitable internet-facing flaw, but it can materially increase impact after an attacker gains a local account.
Technical view
The issue is a DLL injection vulnerability in the InsightAppSec broker’s prunsrv.exe component, mapped to CWE-427. A local authenticated OS user can elevate privileges to the InsightAppSec process level. The CVSS 3.0 score is 7.8 with local access, low complexity, low privileges, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to systems running Rapid7 InsightAppSec broker version 2019.06.24 or earlier. The attacker must already be authenticated locally to the operating system, so risk is highest on shared servers, workstations, or environments where low-privileged accounts exist on broker hosts.
Exploitation context
The provided sources do not cite active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation requires local authenticated access, making this primarily a post-compromise privilege escalation risk rather than an internet-facing initial access issue.
Researcher notes
The key exposure question is whether prunsrv.exe is present as part of an affected InsightAppSec broker installation and running with elevated privileges. The bundle names affected versions but does not provide exploit evidence or a specific fixed version, so remediation should be tied to Rapid7 guidance.
Mitigation direction
- Identify all hosts running the Rapid7 InsightAppSec broker.
- Check whether broker versions are 2019.06.24 or earlier.
- Follow Rapid7’s release notes and vendor guidance for the corrected broker version.
- Restrict local interactive access to broker hosts where possible.
- Monitor broker hosts for unexpected privilege escalation or service tampering.
Validation and detection
- Inventory InsightAppSec broker installations and record installed versions.
- Confirm no broker host remains on version 2019.06.24 or earlier.
- Review local user access on systems hosting the broker.
- Verify monitoring covers privileged service behavior on broker hosts.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-427: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-5631 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.8HighVector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://help.rapid7.com/insightappsec/release-notes/archive/2019/07/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Search Path Element
Uncontrolled Search Path Element represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.