CVE-2020-12783
HIGHCVSS 7.5/10EPSS 4.47%
Last modified
CVE-2020-12783 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.. EPSS estimates a 4.47% chance of exploitation in the next 30 days.
Description
Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Exim | Exim | <= 4.93 |
| Fedoraproject | Fedora | 31 |
| Fedoraproject | Fedora | 32 |
| Debian | Debian Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.10 |
| Canonical | Ubuntu Linux | 20.04 |
References
- http://www.openwall.com/lists/oss-security/2021/05/04/7Exploit, Mailing List, Third Party Advisory
- https://bugs.exim.org/show_bug.cgi?id=2571Third Party Advisory
- https://git.exim.org/exim.git/commit/57aa14b216432be381b6295c312065b2fd034f86Patch, Third Party Advisory
- https://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00017.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/4366-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4687Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/7Exploit, Mailing List, Third Party Advisory
- https://bugs.exim.org/show_bug.cgi?id=2571Third Party Advisory
- https://git.exim.org/exim.git/commit/57aa14b216432be381b6295c312065b2fd034f86Patch, Third Party Advisory
- https://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00017.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/4366-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4687Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-12783?
Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.
How severe is CVE-2020-12783?
CVE-2020-12783 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.47% probability of exploitation in the next 30 days.
How do I fix CVE-2020-12783?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-12783?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST