`CVE-2021-33560` Libgcrypt

Affected software	Libgcrypt
Severity	7.5 High CVSS 3.1 3 scores
Weakness	CWE-203
Published	8 Jun 2021
Updated	14 Oct 2026

Description

Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP.

CWE-325

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: none
Indexed PoC 1 indexed, none at 5+ stars
EPSS 2.4% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	Tool to check whether a PGP client is affected by CVE-2021-33560	1	2021-07-16

Index

Artifact

Stars

First seen

GitHub PoC

Tool to check whether a PGP client is affected by CVE-2021-33560

2021-07-16

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

VRT has not found a public code change for this CVE yet.

Protection none
Action not pursued
Review automated Upstream data
Record active

Decided by	Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read
Finding	This CVE affects a known product, but nothing published names a fix and nothing published shows an exploit. That is a statement about the evidence, not about the defect — it does not mean the vulnerability is unimportant or unreachable, only that neither of the two things VRT can act on exists.

Decided by

Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

Finding

This CVE affects a known product, but nothing published names a fix and nothing published shows an exploit. That is a statement about the evidence, not about the defect — it does not mean the vulnerability is unimportant or unreachable, only that neither of the two things VRT can act on exists.

CVSS

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

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

CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:P/I:N/A:N 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:H/I:N/A:N`	NVD	Primary	published
CVSS 3.1	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`	CISA-ADP	Secondary
CVSS 2.0	5.0	none	`AV:N/AC:L/Au:N/C:P/I:N/A:N`	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 Communications / Configuration (libgcrypt) (1.9.0)
Oracle Critical Patch Update October 2021 ↗	CPU	2021-Q4	Oracle Communications / Measurements (libgcrypt) (1.14.0)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update January 2022 ↗

CPU

2022-Q1

Oracle Communications / Configuration (libgcrypt) (1.9.0)

Oracle Critical Patch Update October 2021 ↗

CPU

2021-Q4

Oracle Communications / Measurements (libgcrypt) (1.14.0)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Communications	Configuration (libgcrypt)	1.9.0	1.9.0
Oracle Communications	Measurements (libgcrypt)	1.14.0	1.14.0

Products and versions

8 products, 13 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	debian	debian linux	generic	9.0
nvd	fedoraproject	fedora	generic	33 · 34
nvd	gnupg	libgcrypt	generic	＜ 1.8.8 · ≥ 1.9.0 and ＜ 1.9.3
nvd	oracle	communications cloud native core binding support function	generic	1.11.0
nvd	oracle	communications cloud native core network function cloud native environment	generic	1.9.0 · 1.10.0
nvd	oracle	communications cloud native core network repository function	generic	1.14.0 · 1.15.0 · 1.15.1
nvd	oracle	communications cloud native core network slice selection function	generic	1.8.0
nvd	oracle	communications cloud native core service communication proxy	generic	1.15.0

Source

Vendor

Product

Scheme

Affected versions

nvd

debian

debian linux

generic

9.0

nvd

fedoraproject

fedora

generic

33 · 34

nvd

gnupg

libgcrypt

generic

＜ 1.8.8 · ≥ 1.9.0 and ＜ 1.9.3

nvd

oracle

communications cloud native core binding support function

generic

1.11.0

nvd

oracle

communications cloud native core network function cloud native environment

generic

1.9.0 · 1.10.0

nvd

oracle

communications cloud native core network repository function

generic

1.14.0 · 1.15.0 · 1.15.1

nvd

oracle

communications cloud native core network slice selection function

generic

1.8.0

nvd

oracle

communications cloud native core service communication proxy

generic

1.15.0

References

URL	Tags
https://dev.gnupg.org/T5305	Release Notes, Vendor Advisory
https://dev.gnupg.org/T5328	Vendor Advisory
https://dev.gnupg.org/T5466	Release Notes, Vendor Advisory
https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61	Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html	Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
https://security.gentoo.org/glsa/202210-13	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html	Patch, Third Party Advisory

URL

Timeline

Published	2021-06-08	By the CVE Program.
NVD record modified	2026-10-14	NVD's own last-modified date for this record.

Published

2021-06-08

By the CVE Program.

NVD record modified

2026-10-14

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

How VRT decided (19 of 24 rules ran)

19 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 no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match 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 no match 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 no match 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 no match An affected Maven artifact named by the CNA itself

11 known-cpe-product matched In scope Matches known products: oracle/communications_cloud_native_core_binding_support_function, oracle/communications_cloud_native_core_network_function_cloud_native_environment, oracle/communications_cloud_native_core_network_repository_function, oracle/communications_cloud_native_core_network_slice_selection_function, oracle/communications_cloud_native_core_service_communication_proxy

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 no match A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven no match The affected package being open source on Maven, so the fix can be read

19 poc-derivable no match 1 GitHub PoC repository(s) indexed, none with 5 or more stars and no reviewed exploit catalogue entry — too little to reverse-engineer a rule from

20 no-exploit decided it matched No exploit published No Exploit-DB, Nuclei or Metasploit entry, and none of the 1 indexed GitHub POC repository(s) has 5 or more stars, and CISA's Vulnrichment assessment records no demonstrated exploit. No upstream fix reference or open-source Maven package was found either, so there is nothing to act on from either direction.

21 secure-rule-match no match A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc skipped 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 skipped 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 skipped 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

Products the scope rules checked

The products this CVE's record names, and whether VRT tracks each one. The scope rules decided on these.

Vendor Product Tracked CPE Source

gnupg libgcrypt not tracked cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*

debian debian_linux not tracked cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

fedoraproject fedora not tracked cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

oracle communications_cloud_native_core_binding_support_function tracked cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:* yaml

oracle communications_cloud_native_core_network_function_cloud_native_environment tracked cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.9.0:*:*:*:*:*:*:* yaml

oracle communications_cloud_native_core_network_repository_function tracked cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.14.0:*:*:*:*:*:*:* yaml

oracle communications_cloud_native_core_network_slice_selection_function tracked cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:* yaml

oracle communications_cloud_native_core_service_communication_proxy tracked cpe:2.3:a:oracle:communications_cloud_native_core_service_communication_proxy:1.15.0:*:*:*:*:*:*:* yaml

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