How severe is CVE-2021-36777?

CVE-2021-36777 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-36777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36777?

CVE-2021-36777 affects Opensuse Open Build Service. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36777?

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-2021-36777 published?

CVE-2021-36777 was published on 2022-03-09 and last updated on 2026-06-17.

CVE-2021-36777

CVE-2021-36777 is a high-severity vulnerability in Opensuse Open Build Service with a CVSS 3.x base score of 8.1. 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-807.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-807
Affected product: Opensuse Open Build Service
Published: 2022-03-09
Last modified: 2026-06-17

Description

A Reliance on Untrusted Inputs in a Security Decision vulnerability in the login proxy of the openSUSE Build service allowed attackers to present users with a expected login form that then sends the clear text credentials to an attacker specified server. This issue affects: openSUSE Build service login-proxy-scripts versions prior to dc000cdfe9b9b715fb92195b1a57559362f689ef.

Frequently asked questions

What is CVE-2021-36777?: A Reliance on Untrusted Inputs in a Security Decision vulnerability in the login proxy of the openSUSE Build service allowed attackers to present users with a expected login form that then sends the clear text credentials to an attacker specified server. This issue affects: openSUSE Build service login-proxy-scripts versions prior to dc000cdfe9b9b715fb92195b1a57559362f689ef.
How severe is CVE-2021-36777?: CVE-2021-36777 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-36777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36777?: CVE-2021-36777 affects Opensuse Open Build Service. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36777?: 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-2021-36777 published?: CVE-2021-36777 was published on 2022-03-09 and last updated on 2026-06-17.

References

https://bugzilla.suse.com/show_bug.cgi?id=1191209

Affected products (1)

cpe:2.3:a:opensuse:open_build_service:*:*:*:*:*:*:*:*

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