CVE-2020-5311

libImaging/SgiRleDecode.c in Pillow before 6.2.2 has an SGI buffer overflow.

Published: 2020-01-02 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-5311 is rated High Risk (70.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.21%). High exploitation likelihood—assess exposure and prioritize remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2020-5311

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 2026-06-23 4.05% 4.21% +0.16%
2 2026-06-19 4.08% 4.05% -0.03%
3 2026-06-15 — 4.08% —

Full EPSS history (39 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-5311

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P 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:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2020-5311

GitHub Security Advisory for CVE-2020-5311

GHSA-r7rm-8j6h-r933 · Severity: critical · Ecosystem: pip — Buffer Copy without Checking Size of Input in Pillow

OS Trackers for CVE-2020-5311

vendor priority summary link
alpine critical CVE-2020-5311: 1 source package rows (py3-pillow); 9 state rows across 9 repos (3.12-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community, edge-main); fixed 9, open 0. https://security.alpinelinux.org/vuln/CVE-2020-5311
debian not yet assigned CVE-2020-5311 not yet assigned priority: Debian including 1 source packages (pillow), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-5311
redhat high — https://access.redhat.com/security/cve/CVE-2020-5311
suse high CVE-2020-5311 severity important: SUSE including 139 source package names (ansible1-1.9.6-9.7.2, ardana-ansible-9.0+git.1591138508.e269bdb-3.22.2, …), 246 product×package rows across 10 product lines (HPE Helion OpenStack 8, HPE Helion OpenStack Cloud 8, … (10 product lines)): Fixed 239, Known Not Affected 7. https://www.suse.com/security/cve/CVE-2020-5311/
ubuntu medium CVE-2020-5311 medium priority: Ubuntu including 1 source packages (pillow), 6 status rows across 6 suites (bionic, disco, eoan, trusty, upstream, xenial): released 3, not-affected 2, ignored 1. https://ubuntu.com/security/CVE-2020-5311

Affected software / configurations for CVE-2020-5311

Vendor Product Version Raw CPE
python pillow < 6.2.2 cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:*:*:*:*
canonical ubuntu_linux 19.10 cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
fedoraproject fedora 30 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

References for CVE-2020-5311

cvelogic Threat Intelligence