CVE-2021-41268

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 35% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Symfony/SecurityBundle is the security system for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Since the rework of the Remember me cookie in version 5.3.0, the cookie is not invalidated when the user changes their password. Attackers can therefore maintain their access to the account even if the password is changed as long as they have had the chance to login once and get a valid remember me cookie. Starting with version 5.3.12, Symfony makes the password part of the signature by default. In that way, when the password changes, then the cookie is not valid anymore.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
66.7%
KEV
Not listed

Published

November 24, 2021

Last Modified

November 21, 2024

References (8)

Affected Packages

(2 across 1 ecosystem)
Packagist(2)
PackageVulnerable rangeFixed inDependents
symfony/security-bundlev5.3.0 ... v5.3.8 (7 versions)5.3.12—
symfony/symfonyv5.3.0 ... v5.3.9 (12 versions)5.3.12—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 05:44 UTCEPSS rescore
  2. 2026-07-11 08:25 UTCEPSS rescore
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  26. 2026-06-12 16:10 UTCOSV refresh
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  60. 2026-05-26 07:17 UTCEPSS rescore
  61. 2026-05-26 07:08 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-41268?
CVE-2021-41268 is a medium vulnerability published on November 24, 2021. Symfony/SecurityBundle is the security system for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Since the rework of the Remember me cookie in version 5.3.0, the cookie is not invalidated when the user changes their password. Attackers can therefore…
When was CVE-2021-41268 disclosed?
CVE-2021-41268 was first published in the National Vulnerability Database on November 24, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-41268 actively exploited?
CVE-2021-41268 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 66.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-41268?
CVE-2021-41268 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2021-41268?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-41268, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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