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Fencer Vulns
high 7.6

CVE-2020-5275 json

Firewall configured with unanimous strategy was not actually unanimous in symfony/security-http

published 2020-03-30 6 y ago modified 2026-09-10 1 mo ago also BIT-symfony-2020-5275 , EUVD-2020-0343 , GHSA-g4m9-5hpf-hx72

cvss
7.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

In symfony/security-http before versions 4.4.7 and 5.0.7, when a `Firewall` checks access control rule, it iterate overs each rule's attributes and stops as soon as the accessDecisionManager decides to grant access on the attribute, preventing the check of next attributes that should have been take into account in an unanimous strategy. The accessDecisionManager is now called with all attributes at once, allowing the unanimous strategy being applied on each attribute. This issue is patched in versions 4.4.7 and 5.0.7.

Patch / fix

  • packagist symfony/security 4.4.7, 5.0.7
  • packagist symfony/security-http 4.4.7, 5.0.7
  • packagist symfony/symfony 4.4.7, 5.0.7
  • bitnami symfony 4.4.7, 5.0.7
  • sensiolabs symfony 4.4.7, 5.0.7
  • symfony Debian 14, Debian 13, Debian 12 4.4.8-1

debian advisories DEBIAN-CVE-2020-5275

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-5275 updated cvss 7.6

symfony: Insuficient atributes checking in firewall function could result in unauthorized access

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
GitHub 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 5.5 AV:N/AC:L/Au:S/C:P/I:P/A:N
OSV 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
packagist symfony/security
>=4.4.0, <4.4.7
>=5.0.0, <5.0.7
4.4.7
5.0.7
packagist symfony/security-http
>=4.4.0, <4.4.7
>=5.0.0, <5.0.7
4.4.7
5.0.7
packagist symfony/symfony
>=4.4.0, <4.4.7
>=5.0.0, <5.0.7
4.4.7
5.0.7
bitnami symfony
>=4.4.0, <4.4.7
>=5.0.0, <5.0.7
4.4.7
5.0.7

Affected products

  • symfony symfony

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.