CVE-2022-24777Public exploitNetwork attack vector

Server crash via incorrect GOAWAY state handling

Published Mar 25, 2022 · Updated Apr 23, 2025

Reachable assertion in gRPC Swift before 1.7.2 allows remote attackers to crash a server with a crafted HTTP/2 GOAWAY sequence. The GRPCIdleHandlerStateMachine.streamCreated path assumes every quiescing connection is a locally initiated client and enforces that assumption with precondition checks instead of accepting a peer-initiated server state. No authentication or user interaction is required; the crash drops all in-flight connections and requests.

CVSS severity7.5
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in gRPC Swift before 1.7.2 allows remote attackers to crash a server with a crafted HTTP/2 GOAWAY sequence. The GRPCIdleHandlerStateMachine.streamCreated path assumes every quiescing connection is a locally initiated client and enforces that assumption with precondition checks instead of accepting a peer-initiated server state. No authentication or user interaction is required; the crash drops all in-flight connections and requests.

The record

CVE
CVE-2022-24777
Published
Mar 25, 2022
Updated
Apr 23, 2025
Vendor
gRPC
Product
gRPC Swift
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

gRPC · gRPC Swiftversion=< 1.7.2

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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