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CVE-2019-11705· NVD / CVE Program· CNA mozilla

A flaw in Thunderbird's implementation of iCal causes a stack buffer overflow in icalrecur_add_bydayrules when processing certain email mess

A flaw in Thunderbird's implementation of iCal causes a stack buffer overflow in icalrecur_add_bydayrules when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.

CriticalCVSS 9.8 · v3.1—Proof of concept Fix available
Published
Jul 23, 2019
Updated
Jun 16, 2026
EPSS
9.9% · 95th percentile
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Action score

42

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 9.9%

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
mozillathunderbird

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla thunderbirdbefore 60.7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Thunderbird

    • unspecified and later · before 60.7.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12thunderbirdbefore 1:60.7.1-11:60.7.1-1
Debian:8thunderbirdbefore 1:60.7.1-1~deb8u11:60.7.1-1~deb8u1
Debian:9thunderbirdbefore 1:60.7.1-1~deb9u11:60.7.1-1~deb9u1
openSUSE:Leap 15.0MozillaThunderbirdbefore 60.7.2-lp151.2.7.160.7.2-lp151.2.7.1
openSUSE:Leap 15.0MozillaThunderbirdbefore 60.7.0-lp151.2.4.160.7.0-lp151.2.4.1
Red Hat:enterprise_linux:6::clientthunderbirdbefore 0:60.7.2-2.el6_100:60.7.2-2.el6_10
Red Hat:enterprise_linux:6::clientthunderbird-debuginfobefore 0:60.7.2-2.el6_100:60.7.2-2.el6_10
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:60.7.2-2.el7_60:60.7.2-2.el7_6
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:60.7.2-2.el7_60:60.7.2-2.el7_6
Red Hat:enterprise_linux:8::appstreamthunderbirdbefore 0:60.7.2-2.el8_00:60.7.2-2.el8_0
Red Hat:enterprise_linux:8::appstreamthunderbird-debuginfobefore 0:60.7.2-2.el8_00:60.7.2-2.el8_0
Red Hat:enterprise_linux:8::appstreamthunderbird-debugsourcebefore 0:60.7.2-2.el8_00:60.7.2-2.el8_0
SUSE:Linux Enterprise Workstation Extension 15MozillaThunderbirdbefore 60.7.2-3.43.160.7.2-3.43.1
SUSE:Linux Enterprise Workstation Extension 15MozillaThunderbirdbefore 60.7.0-3.36.160.7.0-3.36.1
SUSE:Package Hub 12MozillaThunderbirdbefore 60.7.2-85.160.7.2-85.1

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-11704A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in icalmemory_strdup_and_dequote when processing certain email
    42Plan
  • CVE-2019-11703A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages,
    42Plan
  • CVE-2015-2740Buffer overflow in the nsXMLHttpRequest::AppendToResponseText function in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x
    42Plan
  • CVE-2013-5603Use-after-free vulnerability in the nsContentUtils::ContentIsHostIncludingDescendantOf function in Mozilla Firefox before 25.0, Firefox ESR
    42Plan
  • CVE-2013-1719Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 24.0, Thunderbird before 24.0, and SeaMonkey before 2.2
    42Plan
  • CVE-2011-2365Unspecified vulnerability in the browser engine in Mozilla Firefox 3.6.x before 3.6.18 and Thunderbird before 3.1.11 allows remote attackers
    42Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:thunderbird1:60.7.1-1 · Debian:12Package registry (OSV)
opensuse:MozillaThunderbird60.7.0-lp151.2.4.1 · openSUSE:Leap 15.0Package registry (OSV)
red hat:thunderbird0:60.7.2-2.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:thunderbird-debuginfo0:60.7.2-2.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:thunderbird-debugsource0:60.7.2-2.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
suse:MozillaThunderbird60.7.0-3.36.1 · SUSE:Linux Enterprise Workstation Extension 15Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2019-06-17

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-36 d
  2. Published
  3. TodayOct 7, 2026+2633 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records