CVE-2020-12783

7.5 HIGH 5% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure.
Exploit odds: 4.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-05-11 14:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 02:52 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 4.6% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-05-11 14:15 UTC
Last modified: 2026-06-17 02:52 UTC
Exploit probability: 4.6% · EPSS, next 30 days
Weakness: CWE-125 · Out-of-bounds read
Record status: Modified

Affected

Exim ≤ 4.93
Fedoraproject Fedora 31
Fedoraproject Fedora 32
Debian Linux 8.0
Debian Linux 9.0
Debian Linux 10.0
Canonical Ubuntu Linux 14.04
Canonical Ubuntu Linux 16.04

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Raw vector

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

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2020-12783.md and follow it. Check whether this project is affected by CVE-2020-12783. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record