CVE-2021-33833: debian debian_linux Out-of-bounds Write
Vulnerability summary
CVE-2021-33833 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 2.57% chance of exploitation in the next 30 days, higher than 85.2% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3 · Related 2Timeline
- 09-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
ConnMan (aka Connection Manager) 1.30 through 1.39 has a stack-based buffer overflow in uncompress in dnsproxy.c via NAME, RDATA, or RDLENGTH (for A or AAAA).
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
2.57%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.57% on 05-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (openwall.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- connman< 1.36-2.2
- debian_linuxEOL9.0
Mageia2 products
- connman< 1.37-1.2.mga7
- connman< 1.38-2.1.mga8
Intel1 product
- connection_manager≥ 1.30, ≤ 1.39
Ubuntu1 product
- connman< 1.35-6ubuntu0.1~esm1 | < 1.36-2ubuntu0.1
4 vendors · 6 products
References
13 links- www.openwall.com/lists/oss-security/2022/01/25/1Mailing ListX Refsource MLISTExploitThird Party Advisory
lists.debian.org/debian-lts-announce/2022/02/msg00009.htmlMailing ListX Refsource MLISTThird Party Advisory