CVE-2024-31309
HighHTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server.
Published Apr 10, 2024 · Updated Oct 8, 2026 · Also known as DEBIAN-CVE-2024-31309, DLA-3799-1, DSA-5659-1, UBUNTU-CVE-2024-31309
Key Facts
Patch immediately- CVE-2024-31309 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Traffic Server (Apache), Debian Linux, Fedora (Fedoraproject) and 2 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 95% probability of exploitation in the next 30 days.
- Fixed versions are available, including Traffic Server 8.1.10, trafficserver 8.1.10+ds-1~deb11u1, trafficserver 8.1.7-0+deb10u4.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
95%
Higher than 99.8% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2024-31309 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server. Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected.
Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION frames per minute. ATS does have a fixed amount of memory a request can use and ATS adheres to these limits in previous releases. Users are recommended to upgrade to versions 8.1.10 or 9.2.4 which fixes the issue.
Affected Products
23 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Traffic ServerApache | >= 8.0.0 | 8.1.10 |
| Debian LinuxDebian | 10.0 | n/a |
| FedoraFedoraproject | 38, 39, 40 | n/a |
| trafficserver9alpine | See advisory | 9.2.4-r0 |
| trafficserverdebian | See advisory | 8.1.10+ds-1~deb11u1 |
Patched Releases
Traffic Server
8.1.10
trafficserver
8.1.10+ds-1~deb11u1, 8.1.7-0+deb10u4, 9.2.4+ds-0+deb12u1, 9.2.4+ds-1
trafficserver9
9.2.4-r0
Timeline
Publicly disclosed
Apr 10, 2024
Last updated
Oct 8, 2026
Weakness Type
- CWE-20 Improper Input Validation
- CWE-400 Uncontrolled Resource Consumption
References
- advisoryhttps://bugzilla.redhat.com/show_bug.cgi?id=2269627
- advisoryhttps://github.com/apache/trafficserver/commit/d8cb125e55ad7f9cc043e655f7ef25acbbbe0a2c
- advisoryhttps://github.com/apache/trafficserver/pull/11207
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2024/31xxx/CVE-2024-31309.json
- advisoryhttps://lists.apache.org/thread/f9qh3g3jvy153wh82pz4onrfj1wh13kc
FAQ
Common Questions.
HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server.
Affected: Traffic Server (Apache) versions >= 8.0.0; Debian Linux versions 10.0; Fedora (Fedoraproject) versions 38, 39, 40, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Traffic Server 8.1.10, trafficserver 8.1.10+ds-1~deb11u1, trafficserver 8.1.7-0+deb10u4.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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