Apache Traffic Server is vulnerable to HTTP/2 setting flood attacks
Published Oct 22, 2019
7.5
HIGHCVSS 3.1
EPSS 4.56%
Description
Apache Traffic Server is vulnerable to HTTP/2 setting flood attacks. Earlier versions of Apache Traffic Server didn't limit the number of setting frames sent from the client using the HTTP/2 protocol. Users should upgrade to Apache Traffic Server 7.1.7, 8.0.4, or later versions.
Affected products
- Vendor n/a Product Apache Traffic Server Defaultn/a
- Version Apache Traffic Server 6.0.0 to 6.2.3, 7.0.0 to 7.1.6, and 8.0.0 to 8.0.3StatusaffectedConstraints-
- 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 | Apache Traffic Server | n/a |
|
- < 7.1.7
- ≥ 8.0.0 · < 8.0.4
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
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 (25 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 4.56% (0.04561) | 91.32th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.56% (0.04561) | 90.35th | v5 (v2026.06.15) |
| Dec 28, 2025 | 5.10% (0.05102) | 89.48th | v4 (v2025.03.14) |
| Dec 27, 2025 | 4.00% (0.04003) | 88.13th | v4 (v2025.03.14) |
| Oct 28, 2025 | 5.10% (0.05102) | 89.32th | v4 (v2025.03.14) |
| Oct 27, 2025 | 4.00% (0.04003) | 87.97th | v4 (v2025.03.14) |
| Oct 1, 2025 | 5.10% (0.05102) | 89.42th | v4 (v2025.03.14) |
| Jul 30, 2025 | 4.00% (0.04003) | 87.99th | v4 (v2025.03.14) |
| Mar 30, 2025 | 5.10% (0.05102) | 88.83th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.19% (0.06190) | 84.33th | v4 (v2025.03.14) |
| Mar 19, 2025 | 5.10% (0.05102) | 88.55th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.82% (0.03823) | 87.36th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.41% (0.00410) | 74.72th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.36% (0.00360) | 71.43th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.36% (0.00360) | 69.08th | v3 (v2023.03.01) |
| Mar 11, 2023 | 0.25% (0.00252) | 61.27th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.28% (0.00278) | 63.28th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Sep 2, 2022 | 0.95% (0.00954) | 34.50th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00954) | 32.50th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.74% (0.05736) | 77.22th | v2 (v2022.01.01) |
| Feb 3, 2022 | 10.18% (0.10179) | 87.37th | v1 |
| Jan 6, 2022 | 10.18% (0.10179) | 87.22th | v1 |
| Sep 1, 2021 | 2.46% (0.02463) | 78.49th | v1 |
| Apr 14, 2021 | 2.46% (0.02463) | 0.00th | v1 |
References (3)
- https://lists.apache.org/thread.html/392108390cef48af647a2e47b7fd5380e050e35ae8d1aa2030254c04%40%3Cusers.trafficserver.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/ad3d01e767199c1aed8033bb6b3f5bf98c011c7c536f07a5d34b3c19%40%3Cannounce.trafficserver.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/bde52309316ae798186d783a5e29f4ad1527f61c9219a289d0eee0a7%40%3Cdev.trafficserver.apache.org%3E mailing-listx_refsource_MLIST
| Link | Providers | Tags |
|---|---|---|
| https://lists.apache.org/thread.html/392108390cef48af647a2e47b7fd5380e050e35ae8d1aa2030254c04%40%3Cusers.trafficserver.apache.org%3E | mailing-listx_refsource_MLIST | |
| https://lists.apache.org/thread.html/ad3d01e767199c1aed8033bb6b3f5bf98c011c7c536f07a5d34b3c19%40%3Cannounce.trafficserver.apache.org%3E | mailing-listx_refsource_MLIST | |
| https://lists.apache.org/thread.html/bde52309316ae798186d783a5e29f4ad1527f61c9219a289d0eee0a7%40%3Cdev.trafficserver.apache.org%3E | mailing-listx_refsource_MLIST |
Change history (0)
No recorded changes yet.