CVE-2021-22958

highpriority · track · 39EPSS 0.012 · 69 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.23% (69th) EPSS

CVSS 7.5 · high

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:Nsecondary · OSV

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-918USprimaryCWE-918US

affected products (3)

Products and version ranges known to be affected.

n/a https://github.com/concrete5/concrete5≤ Fixed in 8.5.5enisa_euvdEU
concretecms concrete cms< 8.5.5nvdUScpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*
Packagist concrete5/concrete5< 8.5.5osvUSpkg:composer/concrete5/concrete5

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-284f-f2hw-j2gxServer-Side Request Forgery vulnerability in concrete52021-10-12ghsa · osvUS
A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2021-10-07modified 2026-06-17

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+4181 more

references (7)

External citations — patches, advisories, analysis.

https://documentation.concretecms.org/developers/introduction/version-history/855-release-notes cnnvd
https://hackerone.com/reports/863221 cnnvd
https://nvd.nist.gov/vuln/detail/CVE-2021-22958 cnnvd
https://documentation.concretecms.org/developers/introduction/version-history/855-release-notes enisa_euvd
https://hackerone.com/reports/863221 enisa_euvd
https://documentation.concretecms.org/developers/introduction/version-history/855-release-notesRelease NotesVendor Advisorynvd
https://hackerone.com/reports/863221Issue TrackingPermissions RequiredThird Party Advisorynvd

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