libical: Stack buffer overflow in icalrecur_add_bydayrules in icalrecur.c
Published Jul 23, 2019
9.8
CRITICALCVSS 3.1
EPSS 9.90%
Description
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.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<60.7.1
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Thunderbird | n/a |
|
- < 60.7.1
No data.
Red Hat Enterprise Linux 6
thunderbird-0:60.7.2-2.el6_10
Fixed · RHSA-2019:1624
Red Hat Enterprise Linux 7
thunderbird-0:60.7.2-2.el7_6
Fixed · RHSA-2019:1626
Red Hat Enterprise Linux 8
thunderbird-0:60.7.2-2.el8_0
Fixed · RHSA-2019:1623
Red Hat Enterprise Linux 6
libical
Out of support scope
Red Hat Enterprise Linux 7
libical
Not affected
Red Hat Enterprise Linux 8
libical
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | thunderbird-0:60.7.2-2.el6_10 | Fixed | RHSA-2019:1624 |
| Red Hat Enterprise Linux 7 | thunderbird-0:60.7.2-2.el7_6 | Fixed | RHSA-2019:1626 |
| Red Hat Enterprise Linux 8 | thunderbird-0:60.7.2-2.el8_0 | Fixed | RHSA-2019:1623 |
| Red Hat Enterprise Linux 6 | libical | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | libical | Not affected | n/a |
| Red Hat Enterprise Linux 8 | libical | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Thunderbird can be configured to use icaljs instead of libical by setting `calendar.icaljs = true` in preferences, mitigating this vulnerability.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (28 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 9.90% (0.09903) | 95.45th | v5 (v2026.06.15) |
| Jun 15, 2026 | 9.90% (0.09903) | 94.95th | v5 (v2026.06.15) |
| Nov 21, 2025 | 8.71% (0.08708) | 92.13th | v4 (v2025.03.14) |
| Nov 18, 2025 | 7.10% (0.07100) | 90.63th | v4 (v2025.03.14) |
| Mar 30, 2025 | 8.14% (0.08145) | 91.36th | v4 (v2025.03.14) |
| Mar 29, 2025 | 27.59% (0.27594) | 94.31th | v4 (v2025.03.14) |
| Mar 17, 2025 | 8.14% (0.08145) | 91.55th | v4 (v2025.03.14) |
| Dec 17, 2024 | 33.32% (0.33323) | 97.06th | v3 (v2023.03.01) |
| Oct 31, 2024 | 19.55% (0.19549) | 96.42th | v3 (v2023.03.01) |
| Sep 8, 2024 | 21.70% (0.21700) | 96.55th | v3 (v2023.03.01) |
| Aug 3, 2024 | 17.30% (0.17302) | 96.13th | v3 (v2023.03.01) |
| Jul 16, 2024 | 13.52% (0.13517) | 95.65th | v3 (v2023.03.01) |
| Jul 1, 2024 | 13.40% (0.13401) | 95.63th | v3 (v2023.03.01) |
| Jun 13, 2024 | 9.93% (0.09928) | 94.87th | v3 (v2023.03.01) |
| May 12, 2024 | 9.14% (0.09141) | 94.60th | v3 (v2023.03.01) |
| Mar 19, 2024 | 7.99% (0.07993) | 94.11th | v3 (v2023.03.01) |
| May 27, 2023 | 7.02% (0.07019) | 92.93th | v3 (v2023.03.01) |
| May 12, 2023 | 6.16% (0.06158) | 92.43th | v3 (v2023.03.01) |
| Apr 9, 2023 | 5.64% (0.05638) | 92.08th | v3 (v2023.03.01) |
| Mar 22, 2023 | 5.11% (0.05110) | 91.68th | v3 (v2023.03.01) |
| Mar 7, 2023 | 5.16% (0.05164) | 91.72th | v3 (v2023.03.01) |
| Mar 6, 2023 | 8.38% (0.08382) | 93.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 8.38% (0.08382) | 93.35th | v2 (v2022.01.01) |
| Feb 4, 2022 | 29.47% (0.29468) | 96.22th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.63% (0.03630) | 71.73th | v1 |
| Jan 6, 2022 | 3.63% (0.03630) | 71.48th | v1 |
| Sep 1, 2021 | 3.63% (0.03630) | 82.60th | v1 |
| Apr 14, 2021 | 3.63% (0.03630) | 0.00th | v1 |
References (8)
- https://access.redhat.com/security/cve/CVE-2019-11705 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1553808 x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1720008 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2019-11705
- https://security.gentoo.org/glsa/201908-20 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-11705
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-17/
- https://www.mozilla.org/security/advisories/mfsa2019-17/ x_refsource_MISCVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2019-11705 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1553808 | x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1720008 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-11705 | ||
| https://security.gentoo.org/glsa/201908-20 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-11705 | ||
| https://www.mozilla.org/en-US/security/advisories/mfsa2019-17/ | ||
| https://www.mozilla.org/security/advisories/mfsa2019-17/ | x_refsource_MISCVendor Advisory |
Change history (0)
No recorded changes yet.