Security readout for executives and security teams
Plain-English summary
Sympa versions before 6.2.62 may depend on a cookie value for password protection and XSS defenses without ensuring that value exists or is unpredictable. If weak or absent, sensitive password-related data could be easier to compromise.
Executive priority
Prioritize remediation for internet-facing Sympa systems because the issue affects confidentiality and needs no authentication according to CVSS.
Technical view
The flaw is in Sympa’s use of a cookie parameter as both a stored-password salt and an XSS protection mechanism. The CVSS vector indicates network access, low complexity, no privileges, and high confidentiality impact, with no stated integrity or availability impact.
Likely exposure
Exposure is likely limited to organizations running Sympa before 6.2.62, especially internet-facing mailing list services or administrative web interfaces.
Exploitation context
The source bundle does not cite active exploitation, and KEV status is false. Treat this as a credible confidentiality risk, not confirmed in-the-wild exploitation.
Researcher notes
Evidence identifies the vulnerable boundary as Sympa before 6.2.62. The bundle does not provide exploit details, affected package variants, or active exploitation evidence; avoid assuming broader product impact.
Mitigation direction
- Upgrade Sympa to 6.2.62 or later.
- Review the Sympa advisory for vendor-specific remediation details.
- Inventory all public and internal Sympa deployments.
- Assess whether stored password data requires follow-up handling.
- Monitor vendor channels for any additional guidance.
Validation and detection
- Confirm whether Sympa is installed in the environment.
- Check the deployed Sympa version against 6.2.62.
- Review configuration for the referenced cookie parameter.
- Verify remediation on staging before production rollout.
- Document any remaining unsupported or legacy deployments.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-327: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-46900 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use of a Broken or Risky Cryptographic Algorithm
Use of a Broken or Risky Cryptographic Algorithm represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.