CVE-2019-9513
Synology
- Published
- 13 August 2019
- Last modified
- 17 June 2026
- CVSS
- 7.5 v3.1
- Severity
- high
- EPSS
- 81.6% (100th pct)
- CISA KEV
- Not listed
- NVD status
- Modified
- Weaknesses
- CWE-400
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.
Exploitation
Not listed in the CISA Known Exploited Vulnerabilities catalogue as of 2026.09.04. That is an absence of confirmed public exploitation, not evidence that exploitation has not occurred. EPSS models a 81.6% probability of exploitation activity in the next 30 days, placing it in the top decile of all scored CVEs.
Affected products
| Product | Vendor | Type | Versions named |
|---|---|---|---|
| VS960HD | Synology | unknown | < 2.2.3-1505, < 2.3.6-1720 |
References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html third-party
- https://access.redhat.com/errata/RHSA-2019:2692 third-party
- https://access.redhat.com/errata/RHSA-2019:2745 third-party
- https://access.redhat.com/errata/RHSA-2019:2746 third-party
- https://access.redhat.com/errata/RHSA-2019:2775 third-party
- https://access.redhat.com/errata/RHSA-2019:2799 third-party
- https://access.redhat.com/errata/RHSA-2019:2925 third-party
- https://access.redhat.com/errata/RHSA-2019:2939 third-party
- https://access.redhat.com/errata/RHSA-2019:2949 third-party
- https://access.redhat.com/errata/RHSA-2019:2955 third-party
- https://access.redhat.com/errata/RHSA-2019:2966 third-party
- https://access.redhat.com/errata/RHSA-2019:3041 third-party
- https://access.redhat.com/errata/RHSA-2019:3932 third-party
- https://access.redhat.com/errata/RHSA-2019:3933 third-party
- https://access.redhat.com/errata/RHSA-2019:3935 third-party
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md third-party
- https://kb.cert.org/vuls/id/605641/ third-party
- https://kc.mcafee.com/corporate/index?page=content&id=SB10296 third-party
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JUBYAF6ED3O4XCHQ5C2HYENJLXYXZC4M/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZLUYPYY3RX4ZJDWZRJIKSULYRJ4PXW7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/
- https://seclists.org/bugtraq/2019/Aug/40 third-party
- https://seclists.org/bugtraq/2019/Sep/1 third-party
- https://security.netapp.com/advisory/ntap-20190823-0002/ third-party
- https://security.netapp.com/advisory/ntap-20190823-0005/ third-party
- https://support.f5.com/csp/article/K02591030 third-party
- https://support.f5.com/csp/article/K02591030?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4099-1/ third-party
- https://www.debian.org/security/2019/dsa-4505 third-party
- https://www.debian.org/security/2019/dsa-4511 third-party
- https://www.debian.org/security/2020/dsa-4669 third-party
- https://www.oracle.com/security-alerts/cpujan2021.html third-party
- https://www.oracle.com/security-alerts/cpuoct2020.html third-party
- https://www.synology.com/security/advisory/Synology_SA_19_33 third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html third-party
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html third-party
- https://access.redhat.com/errata/RHSA-2019:2692 third-party
- https://access.redhat.com/errata/RHSA-2019:2745 third-party
- https://access.redhat.com/errata/RHSA-2019:2746 third-party
- https://access.redhat.com/errata/RHSA-2019:2775 third-party
- https://access.redhat.com/errata/RHSA-2019:2799 third-party
- https://access.redhat.com/errata/RHSA-2019:2925 third-party
- https://access.redhat.com/errata/RHSA-2019:2939 third-party
- https://access.redhat.com/errata/RHSA-2019:2949 third-party
- https://access.redhat.com/errata/RHSA-2019:2955 third-party
- https://access.redhat.com/errata/RHSA-2019:2966 third-party
- https://access.redhat.com/errata/RHSA-2019:3041 third-party
- https://access.redhat.com/errata/RHSA-2019:3932 third-party
- https://access.redhat.com/errata/RHSA-2019:3933 third-party
- https://access.redhat.com/errata/RHSA-2019:3935 third-party
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md third-party
- https://kb.cert.org/vuls/id/605641/ third-party
- https://kc.mcafee.com/corporate/index?page=content&id=SB10296 third-party
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JUBYAF6ED3O4XCHQ5C2HYENJLXYXZC4M/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZLUYPYY3RX4ZJDWZRJIKSULYRJ4PXW7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/
- https://seclists.org/bugtraq/2019/Aug/40 third-party
- https://seclists.org/bugtraq/2019/Sep/1 third-party
- https://security.netapp.com/advisory/ntap-20190823-0002/ third-party
- https://security.netapp.com/advisory/ntap-20190823-0005/ third-party
- https://support.f5.com/csp/article/K02591030 third-party
- https://support.f5.com/csp/article/K02591030?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/4099-1/ third-party
- https://www.debian.org/security/2019/dsa-4505 third-party
- https://www.debian.org/security/2019/dsa-4511 third-party
- https://www.debian.org/security/2020/dsa-4669 third-party
- https://www.oracle.com/security-alerts/cpujan2021.html third-party
- https://www.oracle.com/security-alerts/cpuoct2020.html third-party
- https://www.synology.com/security/advisory/Synology_SA_19_33 third-party
Record assembled from NVD, CISA KEV 2026.09.04 and FIRST EPSS 2026-09-04. Affected products are those NVD's CPE configuration names that fall inside this site's scope; a CVE may affect products outside it.