IETF HTTP/2 Rapid Reset Attack Vulnerability
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)10 Oct 2023
- Exploited in EUVD (ENISA)10 Oct 2023
- Used by ransomwareno
- EPSS above 10 %100.00%
- No account, over the networkyes
What to do
Fix
Update to a fixed version: 0.17.0
CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
Open source packages OSV
- golang.org/x/netGo · GHSA-qppj-fm5r-hxr3fixed in 0.17.0
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
-
EPSS peak: 100.00%
References
Other exploited vulnerabilities from the same vendor
- CVE-2023-29552Service Location Protocol (SLP) Denial-of-Service Vulnerability7.3 · Background exploitation