Security readout for executives and security teams
Plain-English summary
A remotely delivered, nameless cookie set through insecure HTTP could override a protected Secure cookie in Mozilla products. This could undermine trust in cookie-based sessions and expose sensitive information or allow unauthorized changes. The supplied CVSS score is 9.1, reflecting high confidentiality and integrity impact without required privileges or user interaction.
Executive priority
Prioritize remediation immediately because the flaw crosses the HTTP-to-Secure-cookie trust boundary and carries critical confidentiality and integrity impact. Require rapid fleet-wide version confirmation, while avoiding claims of an active campaign because the supplied evidence does not support one.
Technical view
Cookie parsing accepted a nameless cookie containing an equals sign and allowed it to shadow another cookie carrying the Secure attribute, even when the nameless cookie arrived over HTTP. Mozilla reports fixes in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1. The supplied vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Likely exposure
Exposure is likely where Firefox, Firefox ESR, or Thunderbird installations remain below the named fixed releases. Prioritize internet-using endpoints and managed fleets with delayed browser or mail-client updates. The bundle’s affected-version entries conflict with its statement that 141 and 140.1 are fixed, so validate status against Mozilla advisories.
Exploitation context
The weakness is remotely reachable, low complexity, requires no privileges, and needs no user interaction according to the supplied CVSS vector. However, CVE-2025-8037 is not listed as KEV in the bundle, and no supplied source establishes active exploitation. Treat exploitation status as unconfirmed.
Researcher notes
The source bundle identifies CWE-614 and a 9.1 CVSS score. Its affected array lists 140.1 and 141, while the description identifies those releases as fixes; this appears internally inconsistent. Use Mozilla’s individual advisories as the authority for product branches and do not infer exploit availability from severity alone.
Mitigation direction
- Upgrade Firefox to 141 or later.
- Upgrade Firefox ESR to 140.1 or later.
- Upgrade Thunderbird to 141 or later, or the fixed ESR 140.1 release.
- Consult the applicable Mozilla advisory for product-specific release guidance.
- Accelerate deployment through endpoint and browser-management controls.
Validation and detection
- Inventory installed Firefox, Firefox ESR, and Thunderbird versions.
- Confirm every installation meets or exceeds its applicable fixed release.
- Verify managed-update systems successfully deployed the required versions.
- Review Mozilla advisories for platform-specific applicability and later corrections.
- Re-scan endpoints after remediation and investigate update failures.
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-614: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-8037 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
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.
SSVC decision data
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:H/A:N3.95.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=1964767CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-56/CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-59/CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-61/CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-63/CVE reference, mozilla
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.
Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
Sensitive Cookie in HTTPS Session Without 'Secure' Attribute represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.