CVE-2021-20199

Exp

Rootless containers run with Podman, receive all traffic with a source IP address of 127.0.0.1 (including from remote hosts). This impacts containerized applications that trust localhost (127.0.01) connections by default and do not require authentication. This issue affects Podman 1.8.0 onwards.

Published: 2021-02-02 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-20199 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.13%). 1 public exploit reference(s) are indexed (Exploit-DB). 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-2021-20199

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

Exploit prediction scoring system (EPSS) score for CVE-2021-20199

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 2026-05-31 0.28% 0.13% -0.14%
2 2026-03-11 0.64% 0.28% -0.36%
3 2026-01-28 — 0.64% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-20199

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-20199

GitHub Security Advisory for CVE-2021-20199

OS Trackers for CVE-2021-20199

vendor priority summary link
alpine medium CVE-2021-20199: 1 source package rows (podman); 11 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 4. https://security.alpinelinux.org/vuln/CVE-2021-20199
debian not yet assigned CVE-2021-20199 not yet assigned priority: Debian including 2 source packages (libpod, rootlesskit), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 7. https://security-tracker.debian.org/tracker/CVE-2021-20199
redhat medium — https://access.redhat.com/security/cve/CVE-2021-20199
suse low CVE-2021-20199 severity low: SUSE including 107 source package names (1.8.6.0.3.2.5:libseccomp2-2.5.3-150300.10.5.1, 14.1-rev1.0.0-build2.2.43:libseccomp2-2.5.3-150300.10.5.1, …), 221 product×package rows across 95 product lines (Container bci/bci-init, Container rancher/elemental-teal-rt/5.4, … (95 product lines)): Fixed 221. https://www.suse.com/security/cve/CVE-2021-20199/
ubuntu medium CVE-2021-20199 medium priority: Ubuntu including 1 source packages (libpod), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 7, DNE 6, needs-triage 3. https://ubuntu.com/security/CVE-2021-20199

Affected software / configurations for CVE-2021-20199

Vendor Product Version Raw CPE
podman_project podman >= 1.8.0, < 3.0.0 cpe:2.3:a:podman_project:podman:*:*:*:*:*:*:*:*

References for CVE-2021-20199

cvelogic Threat Intelligence