libesmtp: Stack-based buffer over-read in ntlm_build_type_2() in ntlm/ntlmstruct.c
Published Dec 26, 2019
9.8
CRITICALCVSS 3.1
EPSS 2.94%
Description
libESMTP through 1.0.6 mishandles domain copying into a fixed-size buffer in ntlm_build_type_2 in ntlm/ntlmstruct.c, as demonstrated by a stack-based buffer over-read.
Affected products
No data.
- ≤ 1.0.6
No data.
Red Hat Enterprise Linux 6
libesmtp
Not affected
Red Hat Enterprise Linux 7
libesmtp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | libesmtp | Not affected | n/a |
| Red Hat Enterprise Linux 7 | libesmtp | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of libesmtp as shipped with Red Hat Enterprise Linux 6 and 7.
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
1 other source (Red Hat) ▾
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
No CVSS v3.0 score for this CVE.
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 v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.94% (0.02937) | 86.64th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.06% (0.03056) | 85.83th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.99% (0.00987) | 83.67th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.99% (0.00987) | 83.64th | v3 (v2023.03.01) |
| Sep 11, 2023 | 0.99% (0.00987) | 81.64th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.83% (0.00829) | 79.84th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.56% (0.00562) | 74.29th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00954) | 32.50th | v2 (v2022.01.01) |
| Feb 4, 2022 | 12.49% (0.12492) | 89.83th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.63% (0.03630) | 71.73th | v5 (v2026.06.15) |
| Jan 6, 2022 | 3.63% (0.03630) | 71.48th | v1 |
| Sep 1, 2021 | 0.83% (0.00833) | 57.50th | v1 |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (7)
- https://access.redhat.com/security/cve/CVE-2019-19977 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1788744 Issue Tracking
- https://github.com/Kirin-say/Vulnerabilities/blob/master/Stack_Overflow_in_libesmtp.md x_refsource_MISCExploitPatchThird Party Advisory
- https://github.com/jbouse-debian/libesmtp/blob/ca5bd0800ef1da234315da4c59716568eb5e6402/ntlm/ntlmstruct.c#L228-L242 x_refsource_MISCExploitThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-19977
- https://web.archive.org/web/20190528215510/http://brianstafford.info/libesmtp/ x_refsource_MISCProduct
- https://www.cve.org/CVERecord?id=CVE-2019-19977
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2019-19977 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1788744 | Issue Tracking | |
| https://github.com/Kirin-say/Vulnerabilities/blob/master/Stack_Overflow_in_libesmtp.md | x_refsource_MISCExploitPatchThird Party Advisory | |
| https://github.com/jbouse-debian/libesmtp/blob/ca5bd0800ef1da234315da4c59716568eb5e6402/ntlm/ntlmstruct.c#L228-L242 | x_refsource_MISCExploitThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-19977 | ||
| https://web.archive.org/web/20190528215510/http://brianstafford.info/libesmtp/ | x_refsource_MISCProduct | |
| https://www.cve.org/CVERecord?id=CVE-2019-19977 |
Change history (0)
No recorded changes yet.