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CVE-2023-44487 CISA KEV high CVSS 7.5

[KEV] Vulnerability in IETF HTTP/2 (CVE-2023-44487)

Summary

Vulnerability in IETF HTTP/2 (CVE-2023-44487). Risk of unauthorized operations or information disclosure. Exploitable via Channel. Listed in CISA KEV — actively exploited. Mitigation: upgrade to 0.17.0 or later.

Original description

The description as published by the source.

HTTP/2 Rapid reset attack

The HTTP/2 protocol allows clients to indicate to the server that a previous stream should be canceled by sending a RST_STREAM frame. The protocol does not require the client and server to coordinate the cancellation in any way, the client may do it unilaterally. The client may also assume that the cancellation will take effect immediately when the server receives the RST_STREAM frame, before any other data from that TCP connection is processed.

Abuse of this feature is called a Rapid Reset attack because it relies on the ability for an endpoint to send a RST_STREAM frame immediately after sending a request frame, which makes the other endpoint start working and then rapidly resets the request. The request is canceled, but leaves the HTTP/2 connection open.

The HTTP/2 Rapid Reset attack built on this capability is simple: The client opens a large number of streams at once as in the standard HTTP/2 attack, but rather than waiting for a response to each request stream from the server or proxy, the client cancels each request immediately.

The ability to reset streams immediately allows each connection to have an indefinite number of requests in flight. By explicitly canceling the requests, the attacker never exceeds the limit on the number of concurrent open streams. The number of in-flight requests is no longer dependent on the round-trip time (RTT), but only on the available network bandwidth.

In a typical HTTP/2 server implementation, the ser…

Source: CISA Known Exploited Vulnerabilities NVD GitHub Advisory CISA KEV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2023-44487 has been found in IETF HTTP/2.
Attackers can target a specific entry point like Channel over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
Note: CISA has officially confirmed this is actively exploited in the wild. Treat it with elevated urgency.
What to do: upgrade IETF HTTP/2 to 0.17.0 or later.
If unsure, ask your IT team or search "IETF HTTP/2 CVE-2023-44487" on the vendor's site.

CVE-2023-44487 (IETF HTTP/2) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Channel / EventLoop
Patched: 0.17.0 — apply immediately
Listed in CISA KEV — actively exploited, treat as top priority.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-400) exists in IETF HTTP/2. Attackers reach the vulnerable code path via Channel without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of IETF HTTP/2. Attack surface: Channel / EventLoop.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited in the wild, treat as top priority.

🔧 How to fix

Update to 0.17.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'golang.org/x/net' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'golang.org/x/net' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で golang.org/x/net を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Consider incident declaration escalate 
    Notify SOC / on-call

    CISA KEV登録済 = 実環境で悪用が観測されている。侵入の兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。

  3. 3
    Apply patch patch 
    Upgrade IETF HTTP/2 to 0.17.0

    ステージング環境で 0.17.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  4. 4
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

go golang.org/x/net
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.17.0"}]}]
maven org.apache.tomcat.embed:tomcat-embed-core
[{"type":"ECOSYSTEM","events":[{"introduced":"8.5.0"},{"fixed":"8.5.94"}]}]
swift github.com/apple/swift-nio-http2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.28.0"}]}]
maven org.eclipse.jetty.http2:http2-common
[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0"},{"fixed":"11.0.17"}]}]
maven org.eclipse.jetty.http2:http2-server
[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0"},{"fixed":"11.0.17"}]}]
maven org.eclipse.jetty.http2:jetty-http2-common
[{"type":"ECOSYSTEM","events":[{"introduced":"12.0.0"},{"fixed":"12.0.2"}]}]
maven org.eclipse.jetty.http2:jetty-http2-server
[{"type":"ECOSYSTEM","events":[{"introduced":"12.0.0"},{"fixed":"12.0.2"}]}]
maven com.typesafe.akka:akka-http-core
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.5.3"}]}]
maven com.typesafe.akka:akka-http-core_2.13
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.5.3"}]}]
maven com.typesafe.akka:akka-http-core_2.12
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.5.3"}]}]
maven com.typesafe.akka:akka-http-core_2.11
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"10.1.15"}]}]
maven org.apache.tomcat:tomcat-coyote
[{"type":"ECOSYSTEM","events":[{"introduced":"8.5.0"},{"fixed":"8.5.94"}]}]
Bitnami nginx-ingress-controller
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.9.3"}]}]
Bitnami apisix
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.6.1"}]}]
Bitnami aspnet-core
[{"type":"SEMVER","events":[{"introduced":"6.0.0"},{"fixed":"6.0.23"},{"introduced":"7.0.0"},{"fixed":"7.0.12"}]}]
Bitnami contour
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.24.6"}]}]
Bitnami dotnet-sdk
[{"type":"SEMVER","events":[{"introduced":"6.0.0"},{"fixed":"6.0.23"},{"introduced":"7.0.0"},{"fixed":"7.0.12"}]}]
Bitnami dotnet
[{"type":"SEMVER","events":[{"introduced":"6.0.0"},{"fixed":"6.0.23"},{"introduced":"7.0.0"},{"fixed":"7.0.12"}]}]
Bitnami envoy
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.24.12"},{"introduced":"1.25.0"},{"fixed":"1.25.11"},{"introduced":"1.26.0"},{"fixed":"1.26.6"},{"introduced":"1.27.0"},{"fixed":"1.27.2"}]}]
Bitnami golang
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.20.10"},{"introduced":"1.21.0-0"},{"fixed":"1.21.3"}]}]
Bitnami nginx-gateway
[{"type":"SEMVER","events":[{"introduced":"1.9.5"},{"fixed":"1.25.3"}]}]
Bitnami nginx
[{"type":"SEMVER","events":[{"introduced":"1.9.5"},{"fixed":"1.25.3"}]}]
Bitnami node-min
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"18.18.2"},{"introduced":"19.0.0"},{"fixed":"20.8.1"}]}]
Bitnami node
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"18.18.2"},{"introduced":"19.0.0"},{"fixed":"20.8.1"}]}]
Bitnami jenkins
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.414.3"},{"introduced":"2.415.0"},{"fixed":"2.428.0"}]}]
Bitnami tomcat
[{"type":"SEMVER","events":[{"introduced":"8.5.0"},{"fixed":"8.5.94"},{"introduced":"9.0.0"},{"fixed":"9.0.81"},{"introduced":"10.0.0"},{"fixed":"10.1.14"}]}]
Bitnami varnish
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.0.12"},{"introduced":"6.1.0"},{"fixed":"7.3.1"},{"introduced":"7.4.0"},{"fixed":"7.4.2"}]}]
SwiftURL github.com/apple/swift-nio-http2
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.28.0"}]}]
Bitnami kong
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.4.2"}]}]
Bitnami solr
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"9.4.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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