Is CVE-2021-32785 in the CISA KEV catalog?

No. CVE-2021-32785 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-32785?

CVE-2021-32785 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-32785?

CVE-2021-32785 has an EPSS score of 2.73% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-32785?

Upgrade libapache2-mod-auth-openidc on debian 11 to 2.4.9-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-32785

MEDIUMEPSS 84th pctl

5.3

CVSS v3

NVD

Description

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. When mod_auth_openidc versions prior to 2.4.9 are configured to use an unencrypted Redis cache (`OIDCCacheEncrypt off`, `OIDCSessionType server-cache`, `OIDCCacheType redis`), `mod_auth_openidc` wrongly performed argument interpolation before passing Redis requests to `hiredis`, which would perform it again and lead to an uncontrolled format string bug. Initial assessment shows that this bug does not appear to allow gaining arbitrary code execution, but can reliably provoke a denial of service by repeatedly crashing the Apache workers. This bug has been corrected in version 2.4.9 by performing argument interpolation only once, using the `hiredis` API. As a workaround, this vulnerability can be mitigated by setting `OIDCCacheEncrypt` to `on`, as cache keys are cryptographically hashed before use when this option is enabled.

CWE-134

How to fix

Remediation Available

libapache2-mod-auth-openidcDebian

Fixed in:2.4.9-1CVE-2021-32785

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

2.73%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch2

Mitigation1

github.com

Third-Party Advisory3

Related Vulnerabilities

Other CWE-134 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13160	Critical	9.8	81%	-	Fix
CVE-2023-22374	High	8.5	73%	-	-
CVE-2012-1851	High	10.0	66%	-	-
CVE-2024-23113	Critical	9.8	62%	KEV	-
CVE-2012-3569	High	9.3	48%	-	-
CVE-2018-6317	Critical	9.1	44%	-	-

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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.