8.1
HIGH
CVE-2021-20305
Nettle Elliptic Curve Signature Verification Vulnerability
Description

A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.

INFO

Published Date :

April 5, 2021, 10:15 p.m.

Last Modified :

Nov. 21, 2024, 5:46 a.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

2.2
Public PoC/Exploit Available at Github

CVE-2021-20305 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-20305 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Netapp active_iq_unified_manager
2 Netapp ontap_select_deploy_administration_utility
1 Redhat enterprise_linux
1 Fedoraproject fedora
1 Debian debian_linux
1 Nettle_project nettle

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

AWS ECR Vulnerability Scan CLI

Go

Updated: 2 years, 9 months ago
0 stars 0 fork 0 watcher
Born at : March 20, 2022, 2:54 p.m. This repo has been linked 1 different CVEs too.

None

Shell Python

Updated: 1 month, 2 weeks ago
0 stars 1 fork 1 watcher
Born at : March 19, 2021, 11:41 a.m. This repo has been linked 82 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-20305 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-20305 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=1942533
    Added Reference https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/
    Added Reference https://security.gentoo.org/glsa/202105-31
    Added Reference https://security.netapp.com/advisory/ntap-20211022-0002/
    Added Reference https://www.debian.org/security/2021/dsa-4933
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference Red Hat, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/ [No types assigned]
    Removed Reference Red Hat, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/
  • Modified Analysis by [email protected]

    Dec. 06, 2021

    Action Type Old Value New Value
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html Mailing List, Third Party Advisory
    Changed Reference Type https://security.netapp.com/advisory/ntap-20211022-0002/ No Types Assigned https://security.netapp.com/advisory/ntap-20211022-0002/ Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2021/dsa-4933 No Types Assigned https://www.debian.org/security/2021/dsa-4933 Third Party Advisory
    Added CWE NIST CWE-787
    Added CPE Configuration OR *cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* *cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Oct. 22, 2021

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20211022-0002/ [No Types Assigned]
  • CVE Modified by [email protected]

    Sep. 18, 2021

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 19, 2021

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2021/dsa-4933 [No Types Assigned]
  • Modified Analysis by [email protected]

    Jun. 02, 2021

    Action Type Old Value New Value
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/ Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202105-31 No Types Assigned https://security.gentoo.org/glsa/202105-31 Third Party Advisory
    Changed CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jun. 01, 2021

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 26, 2021

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202105-31 [No Types Assigned]
  • Reanalysis by [email protected]

    Apr. 12, 2021

    Action Type Old Value New Value
    Removed CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P)
    Removed CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  • Initial Analysis by [email protected]

    Apr. 09, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1942533 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1942533 Issue Tracking, Patch, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:nettle_project:nettle:*:*:*:*:*:*:*:* versions up to (excluding) 3.7.2
    Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20305 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.37 }} -0.59%

score

0.72240

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability