CVE-2021-36777

Q: How do I fix CVE-2021-36777?

Upgrade open build service to 2021-10-08 or later.

Q: Is CVE-2021-36777 being actively exploited?

Not that we know of. CVE-2021-36777 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.91% is the estimated probability that it will be exploited in the next 30 days. That is higher than 57% of all scored CVEs.

Q: How severe is CVE-2021-36777?

CVE-2021-36777 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-36777 affect?

Published advisories record a fix for open build service (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

8.1

CVSS v3

NVD

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.

CWE-807

How to fix

Remediation Available

open build serviceNVD

Affected:< 2021-10-08Fixed in:2021-10-08CVE-2021-36777derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Exploit Intelligence

0.91%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Patch1

bugzilla.suse.com

Related Vulnerabilities

Other CWE-807 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-34486	High	7.5	81%	KEV	Fix
CVE-2026-21509	High	7.8	72%	KEV	Fix
CVE-2024-13974	High	8.1	6.7%	-	Fix
CVE-2021-41129	High	8.1	1.8%	-	Fix
CVE-2026-21514	High	7.8	1.5%	KEV	-
CVE-2025-49827	Critical	9.8	1.4%	-	Fix

Common questions

How do I fix CVE-2021-36777?

Upgrade open build service to 2021-10-08 or later.

Is CVE-2021-36777 being actively exploited?

Not that we know of. CVE-2021-36777 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.91% is the estimated probability that it will be exploited in the next 30 days. That is higher than 57% of all scored CVEs.

How severe is CVE-2021-36777?

CVE-2021-36777 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-36777 affect?

Published advisories record a fix for open build service (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-36777

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.