CVE-2021-3580
A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and
02 Description
A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 2.70% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 85.8% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-14.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-08-05 00:00Z5 YR AGO
- Last updated
- 2026-10-14 09:49Z15 DAYS AGO
- Reserved
- 2021-06-04
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-20Improper Input ValidationClass
- Data version
- 5.2
- Document digest
- 8ccfc33a422c6712e056c3881f53f36cbe9cb3fc849b0237c1621970de058108
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1967983
- lists.debian.org[debian-lts-announce] 20210918 [SECURITY] [DLA 2760-1] nettle security updatehttps://lists.debian.org/debian-lts-announce/2021/09/msg00008.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20211104-0006/
- security.gentoo.orgGLSA-202401-24https://security.gentoo.org/glsa/202401-24
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
07 Fixed in
AlmaLinux 8
- gnutls Fixed in 3.6.16-4.el8
- gnutls-c++ Fixed in 3.6.16-4.el8
- gnutls-dane Fixed in 3.6.16-4.el8
- gnutls-devel Fixed in 3.6.16-4.el8
- gnutls-utils Fixed in 3.6.16-4.el8
- nettle Fixed in 3.4.1-7.el8
- nettle-devel Fixed in 3.4.1-7.el8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- nettle Fixed in 3.7.3-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- gnutls Fixed in 3.6.16-4.el8
- gnutls-c++ Fixed in 3.6.16-4.el8
- gnutls-dane Fixed in 3.6.16-4.el8
- gnutls-devel Fixed in 3.6.16-4.el8
- gnutls-utils Fixed in 3.6.16-4.el8
- nettle Fixed in 3.4.1-7.el8
- nettle-devel Fixed in 3.4.1-7.el8
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- nettle Fixed in 3.7.3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- nettle Fixed in 3.7.3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- nettle Fixed in 3.7.3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- nettle No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- nettle No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- nettle Fixed in 3.4.1-0ubuntu0.18.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- nettle Fixed in 3.5.1+really3.5.1-2ubuntu0.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.