How severe is CVE-2021-3131?

CVE-2021-3131 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-3131 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3131?

CVE-2021-3131 affects 1c. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3131?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3131 published?

CVE-2021-3131 was published on 2021-01-13 and last updated on 2026-06-17.

CVE-2021-3131

CVE-2021-3131 is a high-severity vulnerability in 1c with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-326.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-326
Affected product: 1c
Published: 2021-01-13
Last modified: 2026-06-17

Description

The Web server in 1C:Enterprise 8 before 8.3.17.1851 sends base64 encoded credentials in the creds URL parameter.

Frequently asked questions

What is CVE-2021-3131?: The Web server in 1C:Enterprise 8 before 8.3.17.1851 sends base64 encoded credentials in the creds URL parameter.
How severe is CVE-2021-3131?: CVE-2021-3131 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-3131 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3131?: CVE-2021-3131 affects 1c. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3131?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3131 published?: CVE-2021-3131 was published on 2021-01-13 and last updated on 2026-06-17.

References

https://github.com/jet-pentest/CVE-2021-3131

Affected products (1)

cpe:2.3:a:1c:1c\:enterprise:*:*:*:*:*:*:*:*

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