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CVE-2023-44487: HTTP/2 Rapid Reset

Uncontrolled Resource Consumption: Is CVE-2023-44487 real, exploitable, or a false positive? Here's the community verdict.

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signals

public sources

Exploited in wild
Yes
CISA KEV · Oct 10, 2023
Public exploit
Exploit-DB +1
Metasploit/EDB/PoC
Base severity
7.5 High
CVSS
Exploitation prob.
100%
FIRST EPSS
Weakness
CWE-400 · Uncontrolled Resource Consumption
CWE

Confirmed exploited in the wild. Patch this first, regardless of the base score.

cisa ssvc

CISA Vulnrichment · assessed

Exploitation
Active
in the wild
Automatable
Yes
at scale
Technical impact
Partial
on success

CISA decision, by how critical the affected system is to you:

  • low impact → Attend
  • medium impact → Attend
  • high impact → Act

Track: normal patch cycle · Track*: watch closely · Attend: patch sooner · Act: patch now. About SSVC ↗

public exploits

links to sources — we don’t host code
Exploit-DBGitHub PoC(6)unverified

A working exploit is publicly available from a maintained source. Treat this as higher urgency and verify your exposure.

affected packages

GHSA-qppj-fm5r-hxr3 · GitHub rates it moderate
  • Swiftgithub.com/apple/swift-nio-http2
    Vulnerable
    < 1.28.0
    Fixed in
    1.28.0
  • Gogolang.org/x/net
    Vulnerable
    < 0.17.0
    Fixed in
    0.17.0
  • Mavenorg.apache.tomcat:tomcat-coyote
    Vulnerable
    ≥ 11.0.0-M1, < 11.0.0-M12; ≥ 10.0.0, < 10.1.14; ≥ 9.0.0, < 9.0.81; ≥ 8.5.0, < 8.5.94
    Fixed in
    11.0.0-M12, 10.1.14, 9.0.81, 8.5.94
  • Mavenorg.apache.tomcat.embed:tomcat-embed-core
    Vulnerable
    ≥ 11.0.0-M1, < 11.0.0-M12; ≥ 10.0.0, < 10.1.14; ≥ 9.0.0, < 9.0.81; ≥ 8.5.0, < 8.5.94
    Fixed in
    11.0.0-M12, 10.1.14, 9.0.81, 8.5.94
  • Mavenorg.eclipse.jetty.http2:http2-common
    Vulnerable
    ≥ 9.3.0, < 9.4.53; ≥ 10.0.0, < 10.0.17; ≥ 11.0.0, < 11.0.17
    Fixed in
    9.4.53, 10.0.17, 11.0.17
  • Mavenorg.eclipse.jetty.http2:http2-server
    Vulnerable
    ≥ 9.3.0, < 9.4.53; ≥ 10.0.0, < 10.0.17; ≥ 11.0.0, < 11.0.17
    Fixed in
    9.4.53, 10.0.17, 11.0.17
6 more packages
  • Mavenorg.eclipse.jetty.http2:jetty-http2-common
    Vulnerable
    ≥ 12.0.0, < 12.0.2
    Fixed in
    12.0.2
  • Mavenorg.eclipse.jetty.http2:jetty-http2-server
    Vulnerable
    ≥ 12.0.0, < 12.0.2
    Fixed in
    12.0.2
  • Mavencom.typesafe.akka:akka-http-core
    Vulnerable
    < 10.5.3
    Fixed in
    10.5.3
  • Mavencom.typesafe.akka:akka-http-core_2.13
    Vulnerable
    < 10.5.3
    Fixed in
    10.5.3
  • Mavencom.typesafe.akka:akka-http-core_2.12
    Vulnerable
    < 10.5.3
    Fixed in
    10.5.3
  • Mavencom.typesafe.akka:akka-http-core_2.11
    Vulnerable
    ≤ 10.1.15
    Fixed in
    no patched version listed

Source: GitHub Advisory Database (CC-BY 4.0), via OSV.dev. Check your lockfile version against the ranges above.

baseline read

auto · not a community verdict

Real — exploited in the wild

CISA confirms active exploitation. Treat scanner hits as true positives unless your specific version or config is unaffected.

Based on CISA KEV

Confirm or dispute →
Affected:SiemensIetfNghttp2NettyEnvoyproxyEclipseCaddyserverGolang

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

References

NVD MITRE CVE.org CISA KEV VulnCheck KEV

Published · Added to CISA KEV (same day)

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timeline

  1. CISA SSVC assessment · exploitation: active
  2. Published by NVD
  3. Added to VulnCheck KEV · reported exploited in the wild
  4. Added to CISA KEV · confirmed exploited in the wild

Score and exploit changes tracked since .

Community ground truth

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In your experience, is this finding real and exploitable?

awaiting field verdicts
Real, but not a risk here
Not a real issue

Curated baseline: TruePositive's read from public sources is Real & exploitable — a starting point, not a community verdict.

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Field notes & remediation

Verdicts are the quick signal. Notes are the evidence and fixes behind them.

  • 0
    Field note · TruePositive EditorialCurated

    HTTP/2 Rapid Reset Attack Vulnerability — HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS). Listed in the CISA KEV catalog (added 2023-10-10) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~100%. Treat it as real and prioritize remediation over triage.

  • 0
    Remediation · TruePositive EditorialCurated

    Required action for IETF HTTP/2: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA set a federal remediation due date of 2023-10-31. After patching, verify the vulnerable path is no longer reachable before closing the finding.

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Related CVEs

Same weakness: CWE-400 · Uncontrolled Resource Consumption.