CVE-2019-9518
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 25.4%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 25.45% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-770
- Affected
- apple/swiftnio · apache/traffic server · canonical/ubuntu linux · debian/debian linux · synology/skynas · synology/diskstation manager · synology/vs960hd firmware · fedoraproject/fedora · opensuse/leap · redhat/jboss core services · redhat/jboss enterprise application platform · redhat/openshift service mesh · redhat/quay · redhat/software collections · redhat/enterprise linux · oracle/graalvm · mcafee/web gateway · nodejs/node.js
- Source
- cret@cert.org
EPSS 25.4% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.htmlMailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2019/Aug/16Mailing List, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2925Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2939Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2955Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3892Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4352Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0727Third Party Advisory
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.mdThird Party Advisory
- https://kb.cert.org/vuls/id/605641/Third Party Advisory, US Government Resource
- https://kc.mcafee.com/corporate/index?page=content&id=SB10296Third Party Advisory
- https://lists.apache.org/thread.html/091b518265bce56a16af87b77c8cfacda902a02079e866f9fdf13b61%40%3Cusers.trafficserver.apache.org%3E
- https://lists.apache.org/thread.html/2653c56545573b528f3f6352a29eccaf498bd6fb2a6a59568d81a61d%40%3Cannounce.trafficserver.apache.org%3E
- https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/ff5b0821a6985159a832ff6d1a4bd311ac07ecc7db1e2d8bab619107%40%3Cdev.trafficserver.apache.org%3E
- https://lists.apache.org/thread.html/r99a625fb17032646d96cd23dec49603ff630e9318e44a686d63046bc%40%3Ccommits.cassandra.apache.org%3E
- https://lists.apache.org/thread.html/rd31230d01fa6aad18bdadc0720acd1747e53690bd35f73a48e7a9b75%40%3Ccommits.cassandra.apache.org%3E
- 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://seclists.org/bugtraq/2019/Aug/24Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Sep/18Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190823-0005/Third Party Advisory
- https://support.f5.com/csp/article/K46011592Third Party Advisory
- https://support.f5.com/csp/article/K46011592?utm_source=f5support&%3Butm_medium=RSS
- https://www.debian.org/security/2019/dsa-4520Third Party Advisory
- https://www.synology.com/security/advisory/Synology_SA_19_33Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.htmlMailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2019/Aug/16Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.