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Vulnerability details: VCID-uaz7-bd7k-3baa
Vulnerability ID VCID-uaz7-bd7k-3baa
Aliases CVE-2021-1404
Summary A vulnerability in the PDF parsing module in Clam AntiVirus (ClamAV) Software versions 0.103.0 and 0.103.1 could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to improper buffer size tracking that may result in a heap buffer over-read. An attacker could exploit this vulnerability by sending a crafted PDF file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to crash, resulting in a denial of service condition.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-20 Improper Input Validation
CWE-125 Out-of-bounds Read
System Score Found at
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
epss 0.00427 https://api.first.org/data/v1/epss?cve=CVE-2021-1404
cvssv3.1 7.5 https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html
ssvc Track https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-1404
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-1404
archlinux Low https://security.archlinux.org/AVG-1787
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-1404
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1404
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
986622 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986622
AVG-1787 https://security.archlinux.org/AVG-1787
clamav-01032-security-patch-release.html https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html
cpe:2.3:a:clamav:clamav:0.103.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:clamav:clamav:0.103.0:*:*:*:*:*:*:*
cpe:2.3:a:clamav:clamav:0.103.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:clamav:clamav:0.103.1:*:*:*:*:*:*:*
CVE-2021-1404 https://nvd.nist.gov/vuln/detail/CVE-2021-1404
USN-4918-1 https://usn.ubuntu.com/4918-1/
USN-4918-2 https://usn.ubuntu.com/4918-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-11-08T20:02:31Z/ Found at https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1404
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-1404
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.61439
EPSS Score 0.00427
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:28:46.849294+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.14/community.json 37.0.0