CVE-2020-12783: canonical ubuntu_linux Out-of-bounds Read
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2020-12783USN-4366-1DEBIAN-CVE-2020-12783DLA-2213-1DSA-4687-1
Published 11-05-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-12783 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in canonical ubuntu_linux. EPSS estimates a 4.55% chance of exploitation in the next 30 days, higher than 91.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
4.55%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 4 · Related 4Timeline
- 11-05-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
4.55%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
0.00 pp
From 4.55% on 21-09-2026
21-09-202621-10-2026
EPSS score4.55%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (openwall.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian2 products
- exim4< 4.93-16 | < 4.89-2+deb9u7 | < 4.92-8+deb10u4 | < 4.84.2-2+deb8u7
- debian_linuxEOL8.0 | 9.0 | 10.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 19.10 | 20.04
Exim1 product
- exim≤ 4.93
Fedoraproject1 product
- fedoraEOL31 | 32
Ubuntu1 product
- exim4< 4.82-3ubuntu2.4+esm2 | < 4.86.2-2ubuntu2.6 | < 4.90.1-1ubuntu1.5 | < 4.93-13ubuntu1.1
5 vendors · 6 products
References
13 links- git.exim.org/exim.git/commit/57aa14b216432be381b6295c312065b2fd034f86X Refsource CONFIRMPatchThird Party Advisory
- git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0X Refsource CONFIRMPatchThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/05/msg00017.htmlMailing ListX Refsource MLISTThird Party Advisory
- www.openwall.com/lists/oss-security/2021/05/04/7Mailing ListX Refsource MLISTExploitThird Party Advisory