Skip to content
Noroxi
CVE-2020-18652· NVD / CVE Program· CNA mitre

Buffer Overflow vulnerability in WEBP_Support.cpp in exempi 2.5.0 and earlier allows remote attackers to cause a denial of service via openi

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 62.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: exempi (AlmaLinux:8) 2.4.5-4.el8; exempi-devel (AlmaLinux:8) 2.4.5-4.el8; exempi (Debian:10) 2.5.0-2+deb10u1.

Low priority for now. Upgrade to exempi (AlmaLinux:8) 2.4.5-4.el8; exempi-devel (AlmaLinux:8) 2.4.5-4.el8; exempi (Debian:10) 2.5.0-2+deb10u1 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

Buffer Overflow vulnerability in WEBP_Support.cpp in exempi 2.5.0 and earlier allows remote attackers to cause a denial of service via opening of crafted webp file.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Aug 22, 2023
Updated
Jun 16, 2026
EPSS
1.0% · 62th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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

Follow CVE-2020-18652

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Port scanning: 5 full scans a day (members only)
  • Uptime monitoring: 1 site, instant email when it goes down
  • Verify your domain: subdomains and takeover risk scanned every week
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for exempi project records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
exempi projectexempi

Affected versions

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

  • exempi project exempiup to 2.5.0 inclusive

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8exempibefore 2.4.5-4.el82.4.5-4.el8
AlmaLinux:8exempi-develbefore 2.4.5-4.el82.4.5-4.el8
Debian:10exempibefore 2.5.0-2+deb10u12.5.0-2+deb10u1
Debian:12exempibefore 2.5.1-12.5.1-1
Red Hat:enterprise_linux:8::appstreamexempibefore 0:2.4.5-4.el80:2.4.5-4.el8
Red Hat:enterprise_linux:8::appstreamexempi-debuginfobefore 0:2.4.5-4.el80:2.4.5-4.el8
Red Hat:enterprise_linux:8::appstreamexempi-debugsourcebefore 0:2.4.5-4.el80:2.4.5-4.el8
Red Hat:enterprise_linux:8::crbexempi-develbefore 0:2.4.5-4.el80:2.4.5-4.el8
Rocky Linux:8exempibefore 0:2.4.5-4.el80:2.4.5-4.el8
SUSE:Linux Enterprise Module for Desktop Applications 15 SP4exempibefore 2.4.5-150000.3.6.12.4.5-150000.3.6.1
SUSE:Linux Enterprise Module for Desktop Applications 15 SP4exempibefore 2.4.5-150000.3.6.12.4.5-150000.3.6.1

Same product

exempi project: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-12648The WEBP::GetLE32 function in XMPFiles/source/FormatSupport/WEBP_Support.hpp in Exempi 2.4.5 has a NULL pointer dereference.
    31Monitor
  • CVE-2017-18234An issue was discovered in Exempi before 2.4.3.
    31Monitor
  • CVE-2020-18651Buffer Overflow vulnerability in function ID3_Support::ID3v2Frame::getFrameValue in exempi 2.5.0 and earlier allows remote attackers to caus
    26Monitor
  • CVE-2017-18238An issue was discovered in Exempi before 2.4.4.
    22Monitor
  • CVE-2017-18237An issue was discovered in Exempi before 2.4.3.
    22Monitor
  • CVE-2017-18236An issue was discovered in Exempi before 2.4.4.
    22Monitor

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
almalinux:exempi2.4.5-4.el8 · AlmaLinux:8Package registry (OSV)
almalinux:exempi-devel2.4.5-4.el8 · AlmaLinux:8Package registry (OSV)
debian:exempi2.5.1-1 · Debian:12Package registry (OSV)
opensuse:exempi2.4.5-150000.3.6.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:exempi0:2.4.5-4.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:exempi-debuginfo0:2.4.5-4.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:exempi-debugsource0:2.4.5-4.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:exempi-devel0:2.4.5-4.el8 · Red Hat:enterprise_linux:8::crbPackage registry (OSV)
rocky linux:exempi0:2.4.5-4.el8 · Rocky Linux:8Package registry (OSV)
suse:exempi2.4.5-150000.3.6.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

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

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.

No nightly-computed relations.

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).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-primary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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