CVE-2020-2756

Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: Serialization). Supported versions that are affected are Java SE: 7u251, 8u241, 11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Java SE Embedded. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Java SE, Java SE Embedded. Note: Applies to client and server deployment of Java. This vulnerability can be exploited through sandboxed Java Web Start applications and sandboxed Java applets. It can also be exploited by supplying data to APIs in the specified Component without using sandboxed Java Web Start applications or sandboxed Java applets, such as through a web service. CVSS 3.0 Base Score 3.7 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).

Published: 2020-04-15 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-2756 is rated Moderate Risk (50.2/100): CVSS Low severity, with medium exploitation likelihood (EPSS 4.23%). EPSS rose +3.97% over the last day, indicating growing attacker interest. 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-2020-2756

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 0.26% 4.23% +3.97%
2 2025-12-28 0.22% 0.26% +0.04%
3 2025-12-27 — 0.22% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-2756

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.7 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L 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:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.2 1.4 [email protected]
3.7 3.0 LOW
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L 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:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.2 1.4 [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-2020-2756

OS Trackers for CVE-2020-2756

vendor priority summary link
alpine low CVE-2020-2756: 3 source package rows (openjdk11, openjdk7, openjdk8); 17 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 17, open 0. https://security.alpinelinux.org/vuln/CVE-2020-2756
debian not yet assigned CVE-2020-2756 not yet assigned priority: Debian including 2 source packages (openjdk-11, openjdk-8), 3 status rows across 2 suites (bullseye, sid): resolved 3. https://security-tracker.debian.org/tracker/CVE-2020-2756
gentoo normal CVE-2020-2756: 2 GLSA(s) (202006-22, 202209-15), 5 atom(s) (dev-java/icedtea-bin, dev-java/openjdk-bin, dev-java/openjdk-jre-bin, dev-java/oracle-jdk-bin, dev-java/oracle-jre-bin); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-2756
redhat low — https://access.redhat.com/security/cve/CVE-2020-2756
suse high CVE-2020-2756 severity important: SUSE including 389 source package names (10.1.33-openjdk11-59.4:java-11-openjdk-11.0.7.0-3.42.4, 10.1.33-openjdk11-59.4:java-11-openjdk-headless-11.0.7.0-3.42.4, …), 1067 product×package rows across 137 product lines (Container bci/openjdk, Container bci/openjdk-devel, … (137 product lines)): Fixed 836, Known Affected 231. https://www.suse.com/security/cve/CVE-2020-2756/
ubuntu low CVE-2020-2756 low priority: Ubuntu including 4 source packages (openjdk-14, openjdk-7, openjdk-8, openjdk-lts), 24 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): DNE 12, released 9, ignored 1, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2020-2756

Affected software / configurations for CVE-2020-2756

Vendor Product Version Raw CPE
oracle jdk 1.7.0 cpe:2.3:a:oracle:jdk:1.7.0:update251:*:*:*:*:*:*
oracle jdk 1.8.0 cpe:2.3:a:oracle:jdk:1.8.0:update241:*:*:*:*:*:*
oracle jdk 11.0.6 cpe:2.3:a:oracle:jdk:11.0.6:*:*:*:*:*:*:*
oracle jdk 14.0.0 cpe:2.3:a:oracle:jdk:14.0.0:*:*:*:*:*:*:*
oracle jre 1.7.0 cpe:2.3:a:oracle:jre:1.7.0:update251:*:*:*:*:*:*
oracle jre 1.8.0 cpe:2.3:a:oracle:jre:1.8.0:update241:*:*:*:*:*:*
oracle jre 11.0.6 cpe:2.3:a:oracle:jre:11.0.6:*:*:*:*:*:*:*
oracle jre 14.0.0 cpe:2.3:a:oracle:jre:14.0.0:*:*:*:*:*:*:*
oracle openjdk >= 11, <= 11.0.6 cpe:2.3:a:oracle:openjdk:*:*:*:*:*:*:*:*
oracle openjdk >= 13, <= 13.0.2 cpe:2.3:a:oracle:openjdk:*:*:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:-:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update1:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update10:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update101:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update11:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update111:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update121:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update13:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update131:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update141:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update15:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update151:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update161:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update17:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update171:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update181:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update191:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update2:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update201:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update21:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update211:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update221:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update231:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update241:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update25:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update251:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update3:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update4:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update40:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update45:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update5:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update51:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update55:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update6:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update60:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update65:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update67:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update7:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update72:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update76:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update80:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update85:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update9:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update91:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update95:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update97:*:*:*:*:*:*
oracle openjdk 7 cpe:2.3:a:oracle:openjdk:7:update99:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:-:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update101:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update102:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update11:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update111:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update112:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update121:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update131:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update141:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update151:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update152:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update161:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update162:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update171:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update172:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update181:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update191:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update192:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update20:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update201:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update202:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update211:*:*:*:*:*:*
oracle openjdk 8 cpe:2.3:a:oracle:openjdk:8:update212:*:*:*:*:*:*

References for CVE-2020-2756

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00000.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00023.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00048.html Mailing List Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10332 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/04/msg00024.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CKAV6KFFAEANXAN73AFTGU7Z6YNRWCXQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7VHC4EW36KZEIDQ56RPCWBZCQELFFKN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYHHHZRHXCBGRHGE5UP7UEB4IZ2QX536/
https://security.gentoo.org/glsa/202006-22 Third Party Advisory
https://security.gentoo.org/glsa/202209-15 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200416-0004/ Third Party Advisory
https://usn.ubuntu.com/4337-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4662 Third Party Advisory
https://www.debian.org/security/2020/dsa-4668 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html Vendor Advisory
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