CVE-2020-27842

There's a flaw in openjpeg's t2 encoder in versions prior to 2.4.0. An attacker who is able to provide crafted input to be processed by openjpeg could cause a null pointer dereference. The highest impact of this flaw is to application availability.

Published: 2021-01-05 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-27842 is rated Moderate Risk (46.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.44%). Review affected assets and schedule 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-2020-27842

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 2026-06-22 1.46% 1.44% -0.01%
2 2026-06-15 0.44% 1.46% +1.01%
3 2026-05-30 — 0.44% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27842

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P 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:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-27842

OS Trackers for CVE-2020-27842

vendor priority summary link
alpine medium CVE-2020-27842: 1 source package rows (openjpeg); 50 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 50. https://security.alpinelinux.org/vuln/CVE-2020-27842
debian not yet assigned CVE-2020-27842 not yet assigned priority: Debian including 1 source packages (openjpeg2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-27842
gentoo normal CVE-2020-27842: 1 GLSA(s) (202101-29), 1 atom(s) (media-libs/openjpeg); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-27842
redhat low — https://access.redhat.com/security/cve/CVE-2020-27842
suse medium CVE-2020-27842 severity moderate: SUSE including 32 source package names (0.3.2-1.2:libopenjp2-7-2.3.0-150000.3.8.1, 0.3.32-3.4:libopenjp2-7-2.3.0-150000.3.8.1, …), 247 product×package rows across 66 product lines (Container containers/lmcache-vllm-openai, Container containers/open-webui, … (66 product lines)): Fixed 183, Will Not Fix 64. https://www.suse.com/security/cve/CVE-2020-27842/
ubuntu medium CVE-2020-27842 medium priority: Ubuntu including 7 source packages (blender, ghostscript, …), 112 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 31, needs-triage 27, DNE 25, released 17, not-affected 12. https://ubuntu.com/security/CVE-2020-27842

Affected software / configurations for CVE-2020-27842

Vendor Product Version Raw CPE
uclouvain openjpeg < 2.4.0 cpe:2.3:a:uclouvain:openjpeg:*:*:*:*:*:*:*:*
fedoraproject extra_packages_for_enterprise_linux 7.0 cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*
fedoraproject fedora 32 cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
redhat codeready_linux_builder 8.0 cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:*
redhat codeready_linux_builder_for_ibm_z_systems 8.0 cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
redhat codeready_linux_builder_for_power_little_endian 8.0 cpe:2.3:o:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux_for_ibm_z_systems 8.0 cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
redhat enterprise_linux_for_power_little_endian 8.0 cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*
oracle outside_in_technology 8.5.5 cpe:2.3:a:oracle:outside_in_technology:8.5.5:*:*:*:*:*:*:*

References for CVE-2020-27842

cvelogic Threat Intelligence