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CVE-2021-20718

26
FAUCET Score

CVE-2021-20718 is a denial-of-service (DoS) vulnerability affecting mod_auth_openidc versions 2.4.0 to 2.4.7, impacting various Fedora Project and Oracle products. This vulnerability has a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity to cause a complete loss of availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.4.0, <= 2.4.7CPE matchmatch criteria
cpe:2.3:a:openidc:mod_auth_openidc:*:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
< 21.3CPE matchmatch criteria
cpe:2.3:a:oracle:essbase:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.40%
Probability of exploitation in next 30 days
EPSS Percentile
87.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0340 is in the 78th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia msrc
Product: 18363-16823Fixed in: 2.4.14.2-1
microsoftpatch availablevia msrc
Product: cbl2 mod_auth_openidc 2.4.14.2-1 on CBL Mariner 2.0Fixed in: 2.4.14.2-1

Vendor Advisories (2)

redhatCVE-2021-20718Moderate

mod_auth_openidc: DoS in oidc_util_read_post_params() in util.c

May 14, 2021
microsoft2021-May/CVE-2021-20718Important

mod_auth_openidc 2.4.0 to 2.4.7 allows a remote attacker to cause a denial-of-service (DoS) condition via unspecified vectors.

May 11, 2021

References

github.com / zmartzone/mod_auth_openidc
ProductThird Party Advisory
jvn.jp / en/jp/JVN49704918/index.html
Third Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/5HJK366TLFEOIYWTHQSZO24MSDPBXHJU
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/FV4KYMQWPS3I2QPW2C253MLIAFGBZPLK
oracle.com / security-alerts/cpujan2022.html
Third Party Advisory
zmartzone.eu
Vendor Advisory