Security readout for executives and security teams
Plain-English summary
Thunderbird had a memory corruption flaw in its iCalendar email handling. A specially crafted email message could trigger a heap buffer overflow and crash the client, with Mozilla describing the crash as potentially exploitable. The affected range is Thunderbird before 60.7.1.
Executive priority
Prioritize remediation for any remaining legacy Thunderbird deployments. The issue is old but memory-corruption in email handling can create business risk where unpatched desktop clients remain in use.
Technical view
CVE-2019-11704 is a Thunderbird iCal parsing issue in icalmemory_strdup_and_dequote. Processing certain email messages could cause a heap buffer overflow. The public record identifies Thunderbird versions earlier than 60.7.1 as affected. No CVSS, CWE, or detailed exploitability data is provided in the supplied sources.
Likely exposure
Exposure is most likely on endpoints still running Thunderbird versions earlier than 60.7.1, especially where users receive calendar invitations or iCalendar content by email.
Exploitation context
The supplied sources do not show known active exploitation, and the CVE is not listed as KEV. The described trigger is processing certain email messages, so risk depends on vulnerable Thunderbird use and mail exposure.
Researcher notes
Public detail in the supplied bundle is limited. The key facts are the affected product and version boundary, the vulnerable iCal function, and the email-processing trigger. Avoid assuming remote code execution or active exploitation without further vendor-backed evidence.
Mitigation direction
- Upgrade Thunderbird to 60.7.1 or later.
- Review Mozilla MFSA2019-17 and Gentoo GLSA-201908-20 guidance.
- Remove or isolate unsupported Thunderbird installations.
- Use mail security controls to reduce suspicious calendar-message exposure.
Validation and detection
- Inventory Thunderbird installations and versions across managed endpoints.
- Confirm no deployed Thunderbird version is earlier than 60.7.1.
- Review endpoint crash telemetry for Thunderbird iCal-related crashes.
- Check vulnerability scanners for CVE-2019-11704 coverage.
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.
CVE-2019-11704 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mozilla.org/security/advisories/mfsa2019-17/CVE reference · x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1553814CVE reference · x_refsource_MISC
- GLSA-201908-20CVE reference · vendor-advisory, x_refsource_GENTOO
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.