CVE-2021-3942: Certain HP Print products and Digital Sending products may be vulnerable to potential remote code execution and buffer overflow with use of
Noroxi assessment
Priority: Monitor (action score 39/100)
- 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: 1.5% (FIRST EPSS); higher than 75.4% 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.
- According to the record, no fixed version is available yet.
Low priority for now. Update when a fix is released; follow the vendor's advisory.
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
Certain HP Print products and Digital Sending products may be vulnerable to potential remote code execution and buffer overflow with use of Link-Local Multicast Name Resolution or LLMNR.
- Published
- Dec 12, 2022
- Updated
- Jun 17, 2026
- EPSS
- 1.5% · 75th percentile
- CWE
- CWE-119
Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
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
- No fixed version yet
If any of these changes, we'll tell you in the daily email digest.
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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| hp | color laserjet cm4540 mfp cc419a firmware | cpe:2.3:o:hp:color_laserjet_cm4540_mfp_cc419a_firmware |
| hp | color laserjet cm4540 mfp cc419a | cpe:2.3:h:hp:color_laserjet_cm4540_mfp_cc419a |
| hp | color laserjet cm4540 mfp cc420a firmware | cpe:2.3:o:hp:color_laserjet_cm4540_mfp_cc420a_firmware |
| hp | color laserjet cm4540 mfp cc420a | cpe:2.3:h:hp:color_laserjet_cm4540_mfp_cc420a |
| hp | color laserjet cm4540 mfp cc421a firmware | cpe:2.3:o:hp:color_laserjet_cm4540_mfp_cc421a_firmware |
| hp | color laserjet cm4540 mfp cc421a | cpe:2.3:h:hp:color_laserjet_cm4540_mfp_cc421a |
| hp | color laserjet cm5525 mfp ce707a firmware | cpe:2.3:o:hp:color_laserjet_cm5525_mfp_ce707a_firmware |
| hp | color laserjet cm5525 mfp ce707a | cpe:2.3:h:hp:color_laserjet_cm5525_mfp_ce707a |
| hp | color laserjet cm5525 mfp ce708a firmware | cpe:2.3:o:hp:color_laserjet_cm5525_mfp_ce708a_firmware |
| hp | color laserjet cm5525 mfp ce708a | cpe:2.3:h:hp:color_laserjet_cm5525_mfp_ce708a |
| hp | color laserjet cm5525 mfp ce709a firmware | cpe:2.3:o:hp:color_laserjet_cm5525_mfp_ce709a_firmware |
| hp | color laserjet cm5525 mfp ce709a | cpe:2.3:h:hp:color_laserjet_cm5525_mfp_ce709a |
and 188 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- hp color laserjet cm4540 mfp cc419a firmware3.0 and later · before 3.9.9
- hp color laserjet cm4540 mfp cc420a firmware3.0 and later · before 3.9.9
- hp color laserjet cm4540 mfp cc421a firmware3.0 and later · before 3.9.9
- hp color laserjet cm5525 mfp ce707a firmware3.0 and later · before 3.9.9
- hp color laserjet cm5525 mfp ce708a firmware3.0 and later · before 3.9.9
- hp color laserjet cm5525 mfp ce709a firmware3.0 and later · before 3.9.9
- hp color laserjet enterprise flow mfp m577 b5l46a firmwareall versions
- hp color laserjet enterprise flow mfp m577 b5l47a firmwareall versions
- hp color laserjet enterprise flow mfp m577 b5l48a firmwareall versions
- hp color laserjet enterprise flow mfp m577 b5l54a firmwareall versions
- hp color laserjet enterprise flow mfp m680 ca251a firmwareall versions
- hp color laserjet enterprise flow mfp m680 cz248a firmwareall versions
- hp color laserjet enterprise flow mfp m680 cz249a firmwareall versions
- hp color laserjet enterprise flow mfp m680 cz250a firmwareall versions
- hp color laserjet enterprise flow mfp m681 j8a10a firmwareall versions
- hp color laserjet enterprise flow mfp m681 j8a11a firmwareall versions
- hp color laserjet enterprise flow mfp m681 j8a12a firmwareall versions
- hp color laserjet enterprise flow mfp m681 j8a13a firmwareall versions
- hp color laserjet enterprise flow mfp m682 j8a16a firmwareall versions
- hp color laserjet enterprise flow mfp m682 j8a17a firmwareall versions
Versions reported by the vendor
Affected version ranges reported by the assigning authority (hp). Independent of NVD's CPE analysis and usually ahead of it.
HP Inc. HP Print products and Digital Sending products
- See HP Security Bulletin reference for affected versions.affected
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
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.
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 researchersFinders, 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.
- 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-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.