CVE-2022-36937Network attack vector

Insecure transport via hardcoded TLS 1.0 methods

Published May 10, 2023 · Updated Jan 27, 2025

Weak cryptography in Meta Platforms HHVM 4.172.0 and earlier allows attackers to negotiate TLS 1.0 through tls:// URLs. In SSLSocket::setupCrypto, the ClientTLS and ServerTLS cases select TLSv1_client_method() and TLSv1_server_method(), forcing the deprecated protocol instead of version-flexible TLS methods. Exposure requires an application to pass a tls:// URL to stream_socket_client or stream_socket_server; the resulting connection inherits TLS 1.0 transport weaknesses.

CVSS severity9.8
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak cryptography in Meta Platforms HHVM 4.172.0 and earlier allows attackers to negotiate TLS 1.0 through tls:// URLs. In SSLSocket::setupCrypto, the ClientTLS and ServerTLS cases select TLSv1_client_method() and TLSv1_server_method(), forcing the deprecated protocol instead of version-flexible TLS methods. Exposure requires an application to pass a tls:// URL to stream_socket_client or stream_socket_server; the resulting connection inherits TLS 1.0 transport weaknesses.

The record

CVE
CVE-2022-36937
Published
May 10, 2023
Updated
Jan 27, 2025
Vendor
Meta Platforms, Inc.
Product
HHVM
Classifications
CWE-327
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 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=0 <4.153.4
  2. Affected versionversion=4.154.0 <1.168.2
  3. Affected versionversion=4.169.0 <4.169.2
  4. Affected versionversion=4.170.0 <4.170.2
  5. Affected versionversion=4.171.0 <4.171.1
  6. Affected versionversion=4.172.0 <4.172.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · HHVMversion=0 <4.153.4; version=4.154.0 <1.168.2; version=4.169.0 <4.169.2; version=4.170.0 <4.170.2; version=4.171.0 <4.171.1; version=4.172.0 <4.172.1

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm

Public exploit references

No public exploit references are available in this record.

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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