CVE-2024-31309
Apache Traffic Server: HTTP/2 CONTINUATION frames can be utilized for DoS attack
Reported by apache · Published April 10, 2024
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| trafficserver9 | Alpine | 9.2.4-r0 |
| traffic_server | apache | 9.2.4, 9.2.3, 8.1.10, 8.1.9 |
| Apache Traffic Server | Apache Software Foundation | 9.2.3, 8.1.9 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Traffic Server | 8.0.0, 9.0.0 |
| apache | traffic_server | 8.0.0, 9.0.0 |
| alpine | trafficserver9 | 0 |
| Apache Software Foundation | Apache Traffic Server | 8.0.0, 9.0.0 |
Timeline
- Apr 3, 2024 CVE Published
- Apr 9, 2024 PoC Published (3 in total, the first dated here)
- Apr 11, 2024 EPSS Score (30 in total, the first dated here)
- Oct 4, 2024 Coalition ESS Score (30 in total, the first dated here)
- Nov 4, 2025 CVE Updated
- Jan 12, 2026 Security Advisory (130 in total, the first dated here)
- Nov 4, 2026 Distribution Patch (110 in total, the first dated here)
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2024-31309
vulnetix vdb fixes CVE-2024-31309Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2024-31309/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- vendor-advisory
- https://www.kb.cert.org/vuls/id/421644 advisory