CRITICAL KEV Used in ransomware campaigns ⚠
openslp: Heap-based buffer overflow in ProcessSrvRqst() in slpd_process.c leading to remote code execution
Published Dec 6, 2019 ·Due May 3, 2022
9.8
CRITICALCVSS 3.1
EPSS 97.26%
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.
Affected products
- Vendor n/a Product ESXi and Horizon DaaS Defaultn/a
- Version 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.StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | ESXi and Horizon DaaS | n/a |
|
Configuration 1
OR
- ≥ 8.0.0 · < 9.0.0.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.5
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
- 6.7
Configuration 2
OR
- 6.0
- 7.0
- 6.0_s390x
- 7.0_s390x
- 7.7_s390x
- 6.0_ppc64
- 7.0_ppc64
- 7.7_ppc64
- 7.0_ppc64le
- 7.7_ppc64le
- 6.0
- 7.0
- 7.7
- 7.7
- 7.7
- 6.0
- 7.0
Configuration 4
OR
- 30
- 31
No data.
Red Hat Enterprise Linux 6
openslp-1:2.0.0-4.el6_10
Fixed · RHSA-2020:0199
Red Hat Enterprise Linux 7
openslp-1:2.0.0-8.el7_7
Fixed · RHSA-2019:4240
Red Hat Enterprise Linux 8
openslp
Not affected
Red Hat Enterprise Linux 9
openslp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | openslp-1:2.0.0-4.el6_10 | Fixed | RHSA-2020:0199 |
| Red Hat Enterprise Linux 7 | openslp-1:2.0.0-8.el7_7 | Fixed | RHSA-2019:4240 |
| Red Hat Enterprise Linux 8 | openslp | Not affected | n/a |
| Red Hat Enterprise Linux 9 | openslp | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of openslp as shipped with Red Hat Enterprise Linux 8 as they did not include the slpd service component.
Red Hat mitigation
There is no known mitigation.
Metrics
No CVSS v4.0 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
9.8 CRITICAL Red Hat
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
Listed in CISA KEV KEV Used in ransomware campaigns ⚠
Date Added
Nov 3, 2021
Patch Due
May 3, 2022
Required Action
Apply updates per vendor instructions.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Feb 7, 2025 · SSVC 2.0.3
97.26% 0.97258
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.97258
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (28 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 97.26% (0.97258) | 99.89th | v5 (v2026.06.15) |
| Jun 15, 2026 | 96.82% (0.96823) | 99.88th | v5 (v2026.06.15) |
| Nov 21, 2025 | 92.69% (0.92688) | 99.73th | v4 (v2025.03.14) |
| Nov 18, 2025 | 90.89% (0.90894) | 99.71th | v4 (v2025.03.14) |
| Jul 21, 2025 | 92.78% (0.92779) | 99.75th | v4 (v2025.03.14) |
| Jul 16, 2025 | 85.35% (0.85354) | 99.31th | v4 (v2025.03.14) |
| Mar 30, 2025 | 87.07% (0.87066) | 99.40th | v4 (v2025.03.14) |
| Mar 29, 2025 | 90.47% (0.90469) | 99.53th | v4 (v2025.03.14) |
| Mar 28, 2025 | 87.07% (0.87066) | 99.40th | v4 (v2025.03.14) |
| Mar 17, 2025 | 90.47% (0.90469) | 99.59th | v4 (v2025.03.14) |
| Dec 17, 2024 | 20.22% (0.20220) | 96.34th | v3 (v2023.03.01) |
| Dec 12, 2024 | 2.50% (0.02501) | 90.50th | v3 (v2023.03.01) |
| Mar 31, 2024 | 3.27% (0.03272) | 91.08th | v3 (v2023.03.01) |
| Jan 31, 2024 | 4.19% (0.04189) | 91.40th | v3 (v2023.03.01) |
| Nov 12, 2023 | 4.29% (0.04285) | 91.34th | v3 (v2023.03.01) |
| Nov 8, 2023 | 3.78% (0.03777) | 90.82th | v3 (v2023.03.01) |
| Oct 27, 2023 | 11.66% (0.11656) | 94.66th | v3 (v2023.03.01) |
| Oct 10, 2023 | 12.07% (0.12068) | 94.71th | v3 (v2023.03.01) |
| Jul 8, 2023 | 12.18% (0.12178) | 94.61th | v3 (v2023.03.01) |
| May 8, 2023 | 9.24% (0.09240) | 93.72th | v3 (v2023.03.01) |
| Mar 7, 2023 | 9.32% (0.09322) | 93.69th | v3 (v2023.03.01) |
| Mar 6, 2023 | 20.15% (0.20148) | 96.45th | v2 (v2022.01.01) |
| Apr 1, 2022 | 20.15% (0.20148) | 96.12th | v2 (v2022.01.01) |
| Feb 4, 2022 | 20.15% (0.20148) | 94.00th | v2 (v2022.01.01) |
| Feb 3, 2022 | 7.85% (0.07855) | 85.01th | v1 |
| Jan 6, 2022 | 7.85% (0.07855) | 84.84th | v1 |
| Sep 1, 2021 | 7.85% (0.07855) | 92.31th | v1 |
| Apr 14, 2021 | 7.85% (0.07855) | 0.00th | v1 |
Weaknesses (2)
References (15)
- http://www.openwall.com/lists/oss-security/2019/12/10/2 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/12/11/2 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.vmware.com/security/advisories/VMSA-2019-0022.html x_refsource_CONFIRMPatchVendor Advisory
- https://access.redhat.com/errata/RHSA-2019:4240 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0199 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-5544 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1777788 Issue Tracking
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/ vendor-advisoryx_refsource_FEDORARelease Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/ vendor-advisoryx_refsource_FEDORARelease Notes
- https://nvd.nist.gov/vuln/detail/CVE-2019-5544
- https://security.gentoo.org/glsa/202005-12 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5544 government-resourceUS Government Resource
- https://www.cve.org/CVERecord?id=CVE-2019-5544
- https://www.vmware.com/security/advisories/VMSA-2019-0022.html
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner vmware
Published Dec 6, 2019
Updated Oct 21, 2025
Reserved Jan 7, 2019
Link CVE-2019-5544
CISA Vulnrichment
Updated Feb 7, 2025