CVE-2021-4019: debian debian_linux Heap-based Buffer Overflow
CVSS: 7.8v3.1HighAnalyzed
AliasesALPINE-CVE-2021-4019MGASA-2021-0545UBUNTU-CVE-2021-4019DEBIAN-CVE-2021-4019
Published 01-12-2021Last modified 03-11-2025
Vulnerability summary
CVE-2021-4019 is a high (CVSS 7.8) Heap-based Buffer Overflow vulnerability in debian debian_linux. EPSS estimates a 1.93% chance of exploitation in the next 30 days, higher than 79.6% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.8/10
010
High · v3.1 (NVD)EPSS score
1.93%
0%100%
Low · +0.14 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 12 · Related 8Timeline
- 01-12-2021PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
Description
vim is vulnerable to Heap-based Buffer Overflow
CVSS metrics
8 scores · 5 sources · 3 versionsHigh 7.8Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · AlpineEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
High 7.1Preferred score · CVE.org (CNA)
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- NVDNIST7.1HighCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.93%
Chance of exploitation in the next 30 days
Percentile
80%
Versus all other CVEs
30-day change
+0.14 pp
From 1.79% on 18-09-2026
18-09-202618-10-2026
EPSS score1.93%
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
Debian2 products
- vim< 2:8.2.3995-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Alpine1 product
- vim< 8.2.3779-r0
Fedoraproject1 product
- fedoraEOL34 | 35
Mageia1 product
- vim< 8.2.3717-1.mga8
Neovim1 product
- neovim< 0.7.0
Ubuntu1 product
- vim< 2:7.4.052-1ubuntu3.1+esm17 | < 2:7.4.1689-3ubuntu1.5+esm4 | < 2:8.0.1453-1ubuntu1.8 | < 2:8.1.2269-1ubuntu5.6
7 vendors · 9 products
References
20 links
- lists.debian.org/debian-lts-announce/2025/03/msg00023.htmlThird Party Advisory
