CVE-2019-20329Network attack vector

Integrity and confidentiality loss via Host header

Published Jan 2, 2020 · Updated Aug 5, 2024

Origin validation error in OpenLambda 2019-09-10 allows remote attackers to invoke REST API actions via DNS rebinding. The REST API on TCP port 5000 does not validate the Host header, allowing a malicious website to bypass browser same-origin protections and issue requests to the server. The attack requires a user to visit attacker-controlled web content; resulting actions include invoking functions and reading server statistics, with integrity and confidentiality impact but no reported availability impact.

CVSS severity8.1
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in OpenLambda 2019-09-10 allows remote attackers to invoke REST API actions via DNS rebinding. The REST API on TCP port 5000 does not validate the Host header, allowing a malicious website to bypass browser same-origin protections and issue requests to the server. The attack requires a user to visit attacker-controlled web content; resulting actions include invoking functions and reading server statistics, with integrity and confidentiality impact but no reported availability impact.

The record

CVE
CVE-2019-20329
Published
Jan 2, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-346, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
8.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1189Drive-by Compromise

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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