CVE-2021-21311

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2025-09-29. Federal remediation due 2025-10-20.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

98.46% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.

NVD base score

7.2 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-02-11 20:55Z5 YR AGO

Last updated

2025-10-21 23:35Z1 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.2)

CNA CVSS vector

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

Weaknesses

• CWE-918Server-Side Request Forgery (SSRF)Base

Data version

5.1

Document digest

99a7aa60b3b3b64474cd192c9c6edcef43d11b54c29135805001cc7ddc544cae

• github.comhttps://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6x_refsource_CONFIRM
• github.comhttps://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdfx_refsource_MISC
• packagist.orghttps://packagist.org/packages/vrana/adminerx_refsource_MISC
• github.comhttps://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351x_refsource_MISC
• lists.debian.org[debian-lts-announce] 20210302 [SECURITY] [DLA 2580-1] adminer security updatehttps://lists.debian.org/debian-lts-announce/2021/03/msg00002.htmlmailing-listx_refsource_MLIST
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21311government-resource