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ExploitedIn CISA KEVFix available

CVE-2019-5544

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2019-12-06
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2019-12-0616:15CVE publishedNVD
  2. 2021-11-03Added to the CISA KEV catalogCISA KEV
  3. 2021-11-03Listed as exploited by GCVEGCVE
  4. 2021-11-03Exploitation first reportedCISA KEV
  5. 2025-02-0713:13SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-5544?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-5544?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Openslp
BranchAffectedFixed in
2.0≤ 2.0.0no fix published
Vmware esxi
BranchAffectedFixed in
6.0= 6.0no fix published
6.5= 6.5no fix published
6.7= 6.7no fix published
Fedoraproject fedora
BranchAffectedFixed in
30.x= 30no fix published
31.x= 31no fix published

13 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As vmware, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • ESXi and Horizon DaaS
    Affected
    • = ESXi 6.7 prior to patch release ESXi670-201912001, ESXi 6.5 prior to patch release ESXi650-201912001, ESXi 6.0 prior to patch release ESXi600-201912001 and Horizon DaaS 8.x prior to BZ-2467224-Disable_SLPD_service_permanently_801_Hotfix.no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-05-14

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openslpRed Hat:enterprise_linux:7::workstationall versions · fixed in 1:2.0.0-8.el7_7and 3 other packages
  • openslpRed Hat:enterprise_linux:7::serverall versions · fixed in 1:2.0.0-8.el7_7and 3 other packages
  • openslpRed Hat:enterprise_linux:7::computenodeall versions · fixed in 1:2.0.0-8.el7_7and 3 other packages
  • openslpRed Hat:enterprise_linux:7::clientall versions · fixed in 1:2.0.0-8.el7_7and 3 other packages
  • openslpRed Hat:enterprise_linux:6::workstationall versions · fixed in 1:2.0.0-4.el6_10and 3 other packages
  • openslpRed Hat:enterprise_linux:6::serverall versions · fixed in 1:2.0.0-4.el6_10and 3 other packages
  • openslpRed Hat:enterprise_linux:6::computenodeall versions · fixed in 1:2.0.0-4.el6_10and 3 other packages
  • openslpRed Hat:enterprise_linux:6::clientall versions · fixed in 1:2.0.0-4.el6_10and 3 other packages

6 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-5544 Red Hat Product Security392 products fixed

    openslp: Heap-based buffer overflow in ProcessSrvRqst() in slpd_process.c leading to remote code execution

  • RHSA-2020:0199 Red Hat Product Security61 products fixed

    Red Hat Security Advisory: openslp security update

  • RHSA-2019:4240 Red Hat Product Security63 products fixed

    Red Hat Security Advisory: openslp security update

Full record on NVD

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-05-03
  2. Vendor fix Red Hat Product Security RHSA-2020:0199 · 61 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Workaround from the vendor Red Hat Product Security RHSA-2020:0199 · 61 productsThere is no known mitigation.

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedHynekPetrak/CVE-2019-5544_CVE-2020-3992dgh05t/VMware_ESXI_OpenSLP_PoCs
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2022-05-03
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2019-12-06
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-4734-5452-r5fh

Frequently asked questions

What is CVE-2019-5544?

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.

Is CVE-2019-5544 actively exploited?

Yes. CVE-2019-5544 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

What is the CVSS score for CVE-2019-5544?

CVE-2019-5544 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record