Security readout for executives and security teams
Plain-English summary
CVE-2019-11703 is a Thunderbird email-client flaw in iCal message handling. A crafted email message could trigger a heap buffer overflow and a potentially exploitable crash. The source bundle identifies Thunderbird versions before 60.7.1 as affected. No cited source here confirms active exploitation.
Executive priority
Prioritize remediation where Thunderbird is still used for business email, especially on endpoints that process external calendar invitations or email content. This is an old issue, but legacy software creates avoidable risk.
Technical view
Thunderbird's iCal implementation could overflow heap memory in parser_get_next_char while processing certain email messages. The record describes the result as a potentially exploitable crash. The provided data does not include CVSS, CWE, exploit details, or broader affected-product claims beyond Thunderbird before 60.7.1.
Likely exposure
Exposure is limited to environments still running Mozilla Thunderbird versions earlier than 60.7.1, including systems using distribution-provided Thunderbird packages that were not updated after the vendor fix.
Exploitation context
The trigger is processing certain email messages in Thunderbird's iCal handling. The bundle does not state that exploitation is active, and CISA KEV status is false. Treat exploitability as plausible but unconfirmed from these sources.
Researcher notes
The record is sparse: no CVSS vector, CWE, exploit references, or patch mechanics are provided. Analysis should stay anchored to Thunderbird iCal parsing and the pre-60.7.1 affected range until vendor advisories are reviewed directly.
Mitigation direction
- Upgrade Thunderbird to version 60.7.1 or later.
- Apply relevant operating-system or distribution Thunderbird security updates.
- Review Mozilla and Gentoo advisories for environment-specific guidance.
- Prioritize replacement of unsupported legacy Thunderbird installations.
Validation and detection
- Inventory Thunderbird versions across endpoints and servers.
- Flag any Thunderbird installation older than 60.7.1.
- Confirm Linux package versions against vendor security advisories.
- Check whether Thunderbird is still deployed in legacy images or VDI pools.
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-2019-11703 mapping review
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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=1553820CVE 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.