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Weekly Signal
Live intelligence Updated 19 Aug 2026 · 20:27 UTC

Fedoraproject, Openslp, Redhat +1 more · Fedora, Openslp, Enterprise Linux Desktop +14 more

CVE-2019-5544

VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability

Recommended action

Treat this as an immediate remediation priority. Apply updates per vendor instructions.

View response plan
CVSS9.8
EPSS96.8%
KEVYes
ExploitationConfirmed exploitation
PatchPatch or guidance available ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 96.8%; technical severity is CVSS 9.8.

OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue. VMware has evaluated the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8.

Who should care

  • Teams operating Fedora, Openslp, Enterprise Linux Desktop +14 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Fedora, Openslp, Enterprise Linux Desktop +14 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Apply updates per vendor instructions.
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Vendor remediation

Patch and remediation links

Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787
Affected versions
Fedoraproject Fedora (Version: 31); Openslp Openslp (End Including: 2.0.0); Redhat Enterprise Linux Desktop (Version: 7.0); Redhat Enterprise Linux For Ibm Z Systems (Version: 7.0 s390x); Redhat Enterprise Linux For Ibm Z Systems Eus (Version: 7.7 s390x); Redhat Enterprise Linux For Power Big Endian (Version: 7.0 ppc64); Redhat Enterprise Linux For Power Big Endian Eus (Version: 7.7 ppc64); Redhat Enterprise Linux For Power Little Endian (Version: 7.0 ppc64le)
Published
6 December 2019
Attack vector
Network
Privileges required
None
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 96.8%
  4. Signal calculated at 88

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.