CVE-2021-41559 json
Quadratic blowup in Convert::xml2array()
published 2022-06-28 4 y ago modified 2026-06-17 4 mo ago also BIT-silverstripe-2021-41559 , EUVD-2022-6007 , GHSA-9fmg-89fx-r33w
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
Silverstripe silverstripe/framework 4.8.1 has a quadratic blowup in Convert::xml2array() that enables a remote attack via a crafted XML document.
Patch / fix
- packagist silverstripe/framework 4.10.9
- bitnami silverstripe 4.10.9
- silverstripe silverstripe 4.10.9
Exploit prediction
1.09% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | silverstripe/framework | >=4.0.0, <4.10.9 |
4.10.9 |
| bitnami | silverstripe | <4.10.9 |
4.10.9 |
Classification
- Weakness
-
- CWE-776 Improper Restriction of Recursive Entity References in DTDs
References
-
silverstripe.org
/download/security-releases/
not-applicable, vendor-advisory, web
-
github.com
/silverstripe/silverstripe-framework/releases
web, release-notes, vendor-advisory
-
silverstripe.org
/download/security-releases/cve-2021-41559
web, release-notes, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-41559
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2021-41559.yaml
web
-
silverstripe.org
/download/security-releases
web
Sources
- CVE List CVE-2021-41559
- GitHub Advisory GHSA-9fmg-89fx-r33w
- NVD CVE-2021-41559
- OSV BIT-silverstripe-2021-41559
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