CVE-2019-19977
CVE-2019-19977 is a critical-severity vulnerability in Libesmtp Project Libesmtp with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 3% (86th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Libesmtp Project Libesmtp
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2019-19977?
- 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.
- How severe is CVE-2019-19977?
- CVE-2019-19977 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2019-19977 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-19977?
- CVE-2019-19977 affects Libesmtp Project Libesmtp. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-19977?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2019-19977 published?
- CVE-2019-19977 was published on 2019-12-26 and last updated on 2026-06-17.
References
- https://github.com/Kirin-say/Vulnerabilities/blob/master/Stack_Overflow_in_libesmtp.md
- https://github.com/jbouse-debian/libesmtp/blob/ca5bd0800ef1da234315da4c59716568eb5e6402/ntlm/ntlmstruct.c#L228-L242
- https://web.archive.org/web/20190528215510/http://brianstafford.info/libesmtp/
Affected products (1)
- cpe:2.3:a:libesmtp_project:libesmtp:*:*:*:*:*:*:*:*
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