`CVE-2021-23840` OpenSSL

Affected software	OpenSSL
Severity	7.5 High CVSS 3.1 3 scores
Weakness	Integer overflow (CWE-190)
Published	16 Feb 2021
Updated	17 Jun 2026

Description

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

Exploitation status

Forecast only (51% 30-day chance)

No exploit has been reported in the sources we check. EPSS puts this CVE in the top 1.0% of all scored CVEs. That is a model's forecast, not a report of exploitation.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: none
Indexed PoC none indexed
EPSS 51% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

Protection none
Action not pursued none
Review human Researcher
Record active

Decided by	Manual classification of this CVE in the legacy dataset
Finding	A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

Decided by

Manual classification of this CVE in the legacy dataset

Finding

A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

7.5 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary published

CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CISA-ADP Secondary

CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:N/I:N/A:P NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	NVD	Primary	published
CVSS 3.1	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	CISA-ADP	Secondary
CVSS 2.0	5.0	none	`AV:N/AC:L/Au:N/C:N/I:N/A:P`	NVD	Primary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update January 2022 ↗	CPU	2022-Q1	Oracle Systems / XCP Firmware (OpenSSL) (Prior to XCP2410, prior to XCP3110)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update January 2022 ↗

CPU

2022-Q1

Oracle Systems / XCP Firmware (OpenSSL) (Prior to XCP2410, prior to XCP3110)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Systems	XCP Firmware (OpenSSL)	Prior to XCP2410, prior to XCP3110

Family

Component

Versions, as Oracle lists them

Read as

Oracle Systems

XCP Firmware (OpenSSL)

Prior to XCP2410, prior to XCP3110

Products and versions

21 products, 55 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	debian	debian linux	generic	10.0
nvd	fujitsu	m10-1 firmware	generic	＜ 2410 · ＜ 3110
nvd	fujitsu	m10-4 firmware	generic	＜ 2410 · ＜ 3110
nvd	fujitsu	m10-4s firmware	generic	＜ 2410 · ＜ 3110
nvd	fujitsu	m12-1 firmware	generic	＜ 2410 · ＜ 3110
nvd	fujitsu	m12-2 firmware	generic	＜ 2410 · ＜ 3110
nvd	fujitsu	m12-2s firmware	generic	＜ 2410 · ＜ 3110
nvd	mcafee	epolicy orchestrator	generic	5.10.0 · ＜ 5.10.0 · 5.10.0:update_1 · 5.10.0:update_2 · 5.10.0:update_3 · 5.10.0:update_4 · 5.10.0:update_5 · 5.10.0:update_6 · 5.10.0:update_7 · 5.10.0:update_8 · 5.10.0:update_9 · 5.10.0:update_10
nvd	nodejs	node.js	generic	≥ 10.0.0 and ≤ 10.12.0 · ≥ 10.13.0 and ＜ 10.24.0 · ≥ 12.0.0 and ≤ 12.12.0 · ≥ 12.13.0 and ＜ 12.21.0 · ≥ 14.0.0 and ≤ 14.14.0 · 14.15.0 · ≥ 15.0.0 and ＜ 15.10.0
nvd	openssl	openssl	generic	≥ 1.0.2 and ＜ 1.0.2 · ≥ 1.1.1 and ＜ 1.1.1
nvd	oracle	business intelligence	generic	5.5.0.0.0 · 5.9.0.0.0 · 12.2.1.3.0 · 12.2.1.4.0
nvd	oracle	communications cloud native core policy	generic	1.15.0
nvd	oracle	enterprise manager for storage management	generic	13.4.0.0
nvd	oracle	enterprise manager ops center	generic	12.4.0.0
nvd	oracle	graalvm	javase	19.3.5 · 20.3.1.2 · 21.0.0.2
nvd	oracle	jd edwards enterpriseone tools	generic	＜ 9.2.6.0
nvd	oracle	jd edwards world security	generic	a9.4
nvd	oracle	mysql server	generic	＜ 5.7.33 · ≥ 8.0.15 and ＜ 8.0.23
nvd	oracle	nosql database	generic	＜ 20.3
nvd	tenable	log correlation engine	generic	＜ 6.0.8
nvd	tenable	nessus network monitor	generic	5.11.0 · 5.11.1 · 5.12.0 · 5.12.1 · 5.13.0

Source

Vendor

Product

Scheme

Affected versions

nvd

debian

debian linux

generic

10.0

nvd

fujitsu

m10-1 firmware

generic

＜ 2410 · ＜ 3110

nvd

fujitsu

m10-4 firmware

generic

＜ 2410 · ＜ 3110

nvd

fujitsu

m10-4s firmware

generic

＜ 2410 · ＜ 3110

nvd

fujitsu

m12-1 firmware

generic

＜ 2410 · ＜ 3110

nvd

fujitsu

m12-2 firmware

generic

＜ 2410 · ＜ 3110

nvd

fujitsu

m12-2s firmware

generic

＜ 2410 · ＜ 3110

nvd

mcafee

epolicy orchestrator

generic

5.10.0 · ＜ 5.10.0 · 5.10.0:update_1 · 5.10.0:update_2 · 5.10.0:update_3 · 5.10.0:update_4 · 5.10.0:update_5 · 5.10.0:update_6 · 5.10.0:update_7 · 5.10.0:update_8 · 5.10.0:update_9 · 5.10.0:update_10

nvd

nodejs

node.js

generic

≥ 10.0.0 and ≤ 10.12.0 · ≥ 10.13.0 and ＜ 10.24.0 · ≥ 12.0.0 and ≤ 12.12.0 · ≥ 12.13.0 and ＜ 12.21.0 · ≥ 14.0.0 and ≤ 14.14.0 · 14.15.0 · ≥ 15.0.0 and ＜ 15.10.0

nvd

openssl

generic

≥ 1.0.2 and ＜ 1.0.2 · ≥ 1.1.1 and ＜ 1.1.1

nvd

oracle

business intelligence

generic

5.5.0.0.0 · 5.9.0.0.0 · 12.2.1.3.0 · 12.2.1.4.0

nvd

oracle

communications cloud native core policy

generic

1.15.0

nvd

oracle

enterprise manager for storage management

generic

13.4.0.0

nvd

oracle

enterprise manager ops center

generic

12.4.0.0

nvd

oracle

graalvm

javase

19.3.5 · 20.3.1.2 · 21.0.0.2

nvd

oracle

jd edwards enterpriseone tools

generic

＜ 9.2.6.0

nvd

oracle

jd edwards world security

generic

a9.4

nvd

oracle

mysql server

generic

＜ 5.7.33 · ≥ 8.0.15 and ＜ 8.0.23

nvd

oracle

nosql database

generic

＜ 20.3

nvd

tenable

log correlation engine

generic

＜ 6.0.8

nvd

tenable

nessus network monitor

generic

5.11.0 · 5.11.1 · 5.12.0 · 5.12.1 · 5.13.0

Earlier manual review

A reviewer classified this CVE in an older dataset. We kept the labels and products below, but not the reviewer's reasoning.

## Manual Classification Context **Labels:** TLS, NO AUTH REMOTE EXPLOIT, XCP FIRMWARE (OPENSSL) **Products:** OPENSSL, M10-4, M10-4S, ORACLE SYSTEMS, M12-1, M12-2, M12-2S SERVERS, FUJITSU M10-1

References

URL	Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf	Third Party Advisory
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846	Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10366	Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://security.gentoo.org/glsa/202103-03	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210219-0009/	Third Party Advisory
https://security.netapp.com/advisory/ntap-20240621-0006/

URL

Timeline

Published	2021-02-16	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2021-02-16

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (5 of 24 rules ran)

5 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification decided it matched Outside Waratek scope Found in legacy manual classifications

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

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