CVE-2019-5544
CriticalExploitedPublic exploitopenslp-dfsg - security update
Published Jun 11, 2024 · Updated Jun 29, 2026 · Also known as UBUNTU-CVE-2019-5544, USN-4919-1
Key Facts
Patch immediately- CVE-2019-5544 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Openslp, Horizon Daas (Vmware), Fedora (Fedoraproject) and 17 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 11, 2020 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 97% probability of exploitation in the next 30 days.
- Fixed versions are available, including Openslp 1:2.0.0-4.el6_10, Openslp 1:2.0.0-8.amzn2, Openslp 1:2.0.0-8.el7_7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
97%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2019-5544 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | May 3, 2022 | Known |
| Industry KEV feed | Nov 11, 2020 | May 3, 2022 | Known |
| CIRCL KEV | Nov 3, 2021 | May 3, 2022 | Known |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
279 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| OpenslpOpenslp | See advisory | 2.0.0 |
| Horizon DaasVmware | See advisory | 9.0.0.0 |
| FedoraFedoraproject | 30, 31 | n/a |
| Enterprise Linux DesktopRedhat | 6.0, 7.0 | n/a |
| Enterprise Linux For Ibm Z SystemsRedhat | 6.0_s390x, 7.0_s390x | n/a |
Patched Releases
Openslp
1:2.0.0-4.el6_10, 1:2.0.0-8.amzn2, 1:2.0.0-8.el7_7, 2.0.0-26, <=2.0.0
openslp-devel
1:2.0.0-4.el6_10, 1:2.0.0-8.amzn2, 1:2.0.0-8.el7_7
openslp-dfsg
1.2.1-10+deb8u2, 1.2.1-11ubuntu0.16.04.2, 1.2.1-9ubuntu0.3+esm1
openslp-server
1:2.0.0-4.el6_10, 1:2.0.0-8.amzn2, 1:2.0.0-8.el7_7
Horizon Daas
9.0.0.0
Timeline
Added to Industry KEV feed
Nov 11, 2020
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Publicly disclosed
Jun 11, 2024
Last updated
Jun 29, 2026
Weakness Type
- CWE-122 Heap-based Buffer Overflow
- CWE-787 Out-of-bounds Write
References
- advisoryRHSA-2019:4240
- advisoryRHSA-2020:0199
- advisoryGLSA-202005-12
- advisoryhttps://ubuntu.com/security/CVE-2019-5544
- advisoryhttps://ubuntu.com/security/notices/USN-4919-1
FAQ
Common Questions.
OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue.
Affected: Openslp; Horizon Daas (Vmware); Fedora (Fedoraproject) versions 30, 31, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 11, 2020 and is known to be used in ransomware campaigns.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
Fixed versions are available, including Openslp 1:2.0.0-4.el6_10, Openslp 1:2.0.0-8.amzn2, Openslp 1:2.0.0-8.el7_7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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