CVE-2020-11872Network attack vector

TempID and upload-token fabrication via AES-GCM key reuse

Published Apr 17, 2020 · Updated Aug 4, 2024

Cryptographic weakness in OpenTrace 1.0 Cloud Functions allows remote attackers to fabricate TempIDs or Upload Tokens via repeated requests. The subsystem reuses an AES-256-GCM key beyond the 2^32-invocation limit and can generate duplicate IVs, violating required IV-construction constraints. Exploitation requires collecting duplicate IVs or driving more than 2^32 encryptions under one key, after which forged identifiers or upload tokens compromise tracing-data integrity.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic weakness in OpenTrace 1.0 Cloud Functions allows remote attackers to fabricate TempIDs or Upload Tokens via repeated requests. The subsystem reuses an AES-256-GCM key beyond the 2^32-invocation limit and can generate duplicate IVs, violating required IV-construction constraints. Exploitation requires collecting duplicate IVs or driving more than 2^32 encryptions under one key, after which forged identifiers or upload tokens compromise tracing-data integrity.

The record

CVE
CVE-2020-11872
Published
Apr 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/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.

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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 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.

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Technologies

Your stack

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Your stack

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