CVE-2021-3903: debian debian_linux Heap-based Buffer Overflow
CVSS: 7.8v3.1HighModified
AliasesALPINE-CVE-2021-3903RHSA-2024:9405UBUNTU-CVE-2021-3903DEBIAN-CVE-2021-3903
Published 27-10-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-3903 is a high (CVSS 7.8) Heap-based Buffer Overflow vulnerability in debian debian_linux. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 49.9% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.8/10
010
High · v3.1 (NVD)EPSS score
0.65%
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 5 · Related 3Timeline
- 27-10-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
vim is vulnerable to Heap-based Buffer Overflow
CVSS metrics
9 scores · 6 sources · 3 versionsHigh 7.8Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSources5 sources · 5.5–7.8
- OSV · AlpineEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · Red hatEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
High 7.3Preferred score · CVE.org (CNA)
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.3HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
- NVDNIST7.3HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
Medium 4.6Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.65%
Chance of exploitation in the next 30 days
Percentile
50%
Versus all other CVEs
30-day change
0.00 pp
From 0.65% on 18-09-2026
18-09-202618-10-2026
EPSS score0.65%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (huntr.dev)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Redhat12 products
- vim< 2:8.2.2637-21.el9
- vim-common< 2:8.2.2637-21.el9
- vim-common-debuginfo< 2:8.2.2637-21.el9
- vim-debuginfo< 2:8.2.2637-21.el9
- vim-debugsource< 2:8.2.2637-21.el9
Debian2 products
- vim< 2:8.2.3565-1
- debian_linuxEOL9.0
Alpine1 product
- vim< 8.2.3567-r0
Fedoraproject1 product
- fedoraEOL33 | 34 | 35
Ubuntu1 product
- vim< 2:7.4.052-1ubuntu3.1+esm4 | < 2:7.4.1689-3ubuntu1.5+esm3 | < 2:8.0.1453-1ubuntu1.7 | < 2:8.1.2269-1ubuntu5.4 | < 2:8.2.3565-1ubuntu2
6 vendors · 19 products
References
19 links- huntr.dev/bounties/35738a4f-55ce-446c-b836-2fb0b39625f8X Refsource CONFIRMREPORTExploitIssue TrackingPatchThird Party Advisory
- github.com/vim/vim/commit/777e7c21b7627be80961848ac560cb0a9978ff43X Refsource MISCREPORTPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2022/06/msg00014.htmlMailing ListX Refsource MLISTThird Party Advisory
