CVE-2021-31800: fedoraproject fedora
Vulnerability summary
CVE-2021-31800 is a critical (CVSS 9.8) vulnerability in fedoraproject fedora. EPSS estimates a 19.41% chance of exploitation in the next 30 days, higher than 97.3% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 19% (FIRST, 04-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 05-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Multiple path traversal vulnerabilities exist in smbserver.py in Impacket through 0.9.22. An attacker that connects to a running smbserver instance can list and write to arbitrary files via ../ directory traversal. This could potentially be abused to achieve arbitrary code execution by replacing /etc/shadow or an SSH authorized key.
CVSS metrics
7 scores · 5 sources · 3 versions- OSV · PypiEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- 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
- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
19.41%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
No change 0.00 pp
From 19.41% 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
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- py3-impacket< 0.9.23-r0
Debian1 product
- impacket< 0.9.22-2
Fedoraproject1 product
- fedoraEOL32 | 33 | 34
Opensuse1 product
- python-impacket&distro=openSUSE Tumbleweed< 0.11.0-3.3
PyPI1 product
- impacket< 0.9.23 | < 49c643bf66620646884ed141c94e5fdd85bcdd2f | ≥ 0.9.10, < 0.9.23
Secureauth1 product
- impacket≤ 0.9.22
Ubuntu1 product
- impacketAll versions (No fix recorded)
7 vendors · 7 products
References
26 links- github.com/SecureAuthCorp/impacket/releasesX Refsource MISCWEBREPORTRelease NotesThird Party Advisory
- github.com/SecureAuthCorp/impacket/commit/49c643bf66620646884ed141c94e5fdd85bcdd2fX Refsource MISCWEBFIXREPORTPatchThird Party Advisory
Show all 26 references
- github.com/fortra/impacketPACKAGE
