CVE-2021-46671

Exp

options.c in atftp before 0.7.5 reads past the end of an array, and consequently discloses server-side /etc/group data to a remote client.

Published: 2022-02-04 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-46671 is rated High Exploit Risk (61/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.33%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.21% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-46671

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-46671

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.12% 1.33% +1.21%
2 2025-11-21 0.38% 0.12% -0.26%
3 2025-11-18 — 0.38% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-46671

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-46671

OS Trackers for CVE-2021-46671

vendor priority summary link
debian not yet assigned CVE-2021-46671 not yet assigned priority: Debian including 1 source packages (atftp), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-46671
suse low CVE-2021-46671 severity low: SUSE including 3 source package names (atftp-0.7.0-135.16.16.9.1, atftp-0.7.0-135.23.9.1, atftp-0.7.0-160.14.1), 5 product×package rows across 5 product lines (SUSE Linux Enterprise Server 11 SP1-TERADATA, SUSE Linux Enterprise Server 11 SP3-TERADATA, … (5 product lines)): Fixed 5. https://www.suse.com/security/cve/CVE-2021-46671/
ubuntu medium CVE-2021-46671 medium priority: Ubuntu including 1 source packages (atftp), 9 status rows across 9 suites (bionic, focal, impish, jammy, kinetic, lunar, trusty, upstream, xenial): released 4, ignored 3, not-affected 2. https://ubuntu.com/security/CVE-2021-46671

Affected software / configurations for CVE-2021-46671

Vendor Product Version Raw CPE
atftp_project atftp < 0.7.5 cpe:2.3:a:atftp_project:atftp:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2021-46671

URL Tags
https://bugs.debian.org/1004974 Exploit Issue Tracking Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00040.html Mailing List Third Party Advisory
https://sourceforge.net/p/atftp/code/ci/9cf799c40738722001552618518279e9f0ef62e5 Patch Third Party Advisory
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