CVE-2022-0618
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HTTP/2 frame. This vulnerability is caused by a logical error when parsing a HTTP/2 HEADERS or HTTP/2 PUSH_PROMISE frame where the frame contains padding information without any other data. This logical error caused confusion about the size of the frame, leading to a parsing error. This parsing error immediately crashes the entire process. Sending a HEADERS frame or PUSH_PROMISE frame with HTTP/2 padding information does not require any special permission, so any HTTP/2 connection peer may send such a frame. For clients, this means any server to which they connect may launch this attack. For servers, anyone they allow to connect to them may launch such an attack. The attack is low-effort: it takes very little resources to send an appropriately crafted frame. The impact on availability is high: receiving the frame immediately crashes the server, dropping all in-flight connections and causing the service to need to restart. It is straightforward for an attacker to repeatedly send appropriately crafted frames, so attackers require very few resources to achieve a substantial denial of service. The attack does not have any confidentiality or integrity risks in and of itself: swift-nio-http2 is parsing the frame in memory-safe code, so the crash is safe. However, sudden process crashes can lead to violations of invariants in services, so it is possible that this attack can be used to trigger an error condition that has confidentiality or integrity risks. The risk can be mitigated if untrusted peers can be prevented from communicating with the service. This mitigation is not available to many services. The issue is fixed by rewriting the parsing code to correctly handle the condition. The issue was found by automated fuzzing by oss-fuzz.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA logical error in swift-nio-http2's parsing of HTTP/2 HEADERS and PUSH_PROMISE frames allows any peer to send a specially crafted frame containing padding without other data, causing the parser to miscalculate frame size and crash the entire process.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 1.0.0, < 1.20.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify swift-nio-http2 is present in the projectInspect the project's dependency manifest (Package.swift, Package.resolved, Podfile.lock, or equivalent) and search for the swift-nio-http2 packageAffected if swift-nio-http2 is listed as a dependency
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Identify the installed version of swift-nio-http2Locate the resolved or locked version of swift-nio-http2 in the dependency lock file (such as Package.resolved, Package.lock, or Podfile.lock)Affected if The resolved version is >= 1.0.0 and < 1.20.0
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Confirm HTTP/2 server functionality is enabledInspect the application code and configuration to determine if the system acts as an HTTP/2 server using NIO and accepts incoming HTTP/2 connectionsAffected if The application runs an HTTP/2 server using swift-nio-http2 to handle incoming connections
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Determine if the HTTP/2 server accepts untrusted connectionsReview network listener configuration, firewall rules, and authentication layers to see if the HTTP/2 port is exposed to untrusted or unauthenticated clientsAffected if The HTTP/2 server accepts connections from untrusted or unauthenticated peers on any network interface
The environment is affected if swift-nio-http2 version 1.0.0 through 1.19.x is in use and the application operates as an HTTP/2 server that accepts connections from untrusted peers.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped1.20.0
Prevent untrusted peers from connecting, or upgrade to the patched version of swift-nio-http2 that correctly handles padding-only frames.
swift-nio-http2 version 1.20.0
- 1. Identify all projects or services that depend on swift-nio-http2 with version < 1.20.0
- 2. Update the package dependency to swift-nio-http2 version 1.20.0 or later
- 3. Rebuild and redeploy the affected services
- 4. Verify the services start successfully and handle HTTP/2 connections normally
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-0618 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-0618 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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