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NVD / CVE Program· CNA cisco

CVE-2025-20260: ClamAV PDF Scanning Buffer Overflow Vulnerability

Noroxi assessment

Priority: Monitor (action score 39/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 76.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: clamav (Alpine:v3.22) 1.4.3-r0; clamav (Debian:11) 1.0.9+dfsg-1~deb11u1; clamav (Debian:12) 1.0.9+dfsg-1~deb12u1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to clamav (Alpine:v3.22) 1.4.3-r0; clamav (Debian:11) 1.0.9+dfsg-1~deb11u1; clamav (Debian:12) 1.0.9+dfsg-1~deb12u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device. This vulnerability exists because memory buffers are allocated incorrectly when PDF files are processed. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to trigger a buffer overflow, likely resulting in the termination of the ClamAV scanning process and a DoS condition on the affected software. Although unproven, there is also a possibility that an attacker could leverage the buffer overflow to execute arbitrary code with the privileges of the ClamAV process.

CriticalCVSS 9.8 · v3.1—Proof of concept Fix available
Published
Jun 18, 2025
Updated
Nov 3, 2026
EPSS
1.6% · 76th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · cisco
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-20260

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
clamavclamav

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • clamav clamavbefore 1.0.9
  • clamav clamav1.2.0 and later · before 1.4.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

  • Cisco ClamAV

    • 1.4.2, 1.4.1, 1.4.0, 1.3.2, 1.3.1, 1.3.0, 1.2.3, 1.2.2, 1.2.1, 1.2.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.22clamavfrom 1.2.0 · before 1.4.3-r01.4.3-r0
Debian:11clamavbefore 1.0.9+dfsg-1~deb11u11.0.9+dfsg-1~deb11u1
Debian:12clamavbefore 1.0.9+dfsg-1~deb12u11.0.9+dfsg-1~deb12u1
Debian:13clamavbefore 1.4.3+dfsg-11.4.3+dfsg-1
openSUSE:Leap 15.6clamavbefore 1.4.3-150600.18.18.11.4.3-150600.18.18.1
openSUSE:Tumbleweedclamavbefore 1.4.3-1.11.4.3-1.1
SUSE:Linux Enterprise Micro 5.5clamavbefore 1.4.3-150200.8.14.11.4.3-150200.8.14.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6clamavbefore 1.4.3-150600.18.18.11.4.3-150600.18.18.1
SUSE:Linux Enterprise Server 12 SP5-LTSSclamavbefore 1.4.3-3.47.11.4.3-3.47.1

Same product

clamav: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-20032On Feb 15, 2023, the following vulnerability in the ClamAV scanning library was disclosed: A vulnerability in the HFS+ partition file p
    48Plan
  • CVE-2024-20328ClamAV VirusEvent File Processing Command Injection Vulnerability
    46Plan
  • CVE-2017-12379ClamAV AntiVirus software versions 0.99.2 and prior contain a vulnerability that could allow an unauthenticated, remote attacker to cause a
    43Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-20128Jan 22, 2025 · ClamAV OLE2 File Format Decryption Denial of Service Vulnerability
    31Monitor
  • ← EarlierCVE-2025-20234Jun 18, 2025 · ClamAV UDF File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability
    30Monitor
  • Later →CVE-2026-20213Jul 1, 2026 · ClamAV PE File Format Processing Out-of-Bounds Memory Corruption Vulnerability
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:clamav1.4.3-r0 · Alpine:v3.22Package registry (OSV)
debian:clamav1.0.9+dfsg-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:clamav1.4.3-150600.18.18.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:clamav1.4.3-150200.8.14.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:clamav1.4.3-150600.18.18.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02025-10-27
Proof-of-concept repository on GitHubstars:02025-11-13

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+130 d
  3. TodayNov 7, 2026+507 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-20128147 days apartClamAV OLE2 File Format Decryption Denial of Service Vulnerability
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records