CVE-2021-3131Network attack vector

Credential disclosure via Base64 data in URLs

Published Jan 13, 2021 · Updated Aug 3, 2024

Credential exposure in the 1C:Enterprise 8 Web server before 8.3.17.1851 allows remote attackers to obtain encoded credentials from URLs. The Web server places Base64-encoded credentials in the creds URL parameter, leaving secrecy dependent on URL handling rather than encryption. The affected Web server workflow must be exposed; the reported consequence is credential disclosure without integrity or availability impact.

CVSS severity7.5
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in the 1C:Enterprise 8 Web server before 8.3.17.1851 allows remote attackers to obtain encoded credentials from URLs. The Web server places Base64-encoded credentials in the creds URL parameter, leaving secrecy dependent on URL handling rather than encryption. The affected Web server workflow must be exposed; the reported consequence is credential disclosure without integrity or availability impact.

The record

CVE
CVE-2021-3131
Published
Jan 13, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-326
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/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 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-326Inadequate Encryption Strength

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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