Improper Input Validation in Modem Firmware
Affects Unisoc modem firmware on the UDX710 chipset, where improper input validation of a dedicated PUCCH configuration can cause a system crash. No fix is listed in the checked facts.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
Do first: Workaround: The checked facts give no workaround and no fix. Watch the vendor's advisory for a patched modem firmware release.
- Exploitation0/40No signal
- Exposure20/25No login or user action needed, CISA rates it automatable · Data gap: Advisories don't say whether default setups are affected
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity7.5/10CVSS 7.5
- No patch5/5No patch listed yet
What would change the score
- Would score about 78 if added to CISA KEV
- Would score about 73 if CISA's SSVC rates exploitation active
- Would score about 38 if advisories confirm default setups are exposed
CVE-2026-79405 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.5 (high) and affects Modem; no fixed version is listed yet.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.71% · 53rd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 33/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
In Modem Firmware, improper input validation of dedicated PUCCH configuration can crash the system. An attacker can trigger this remotely, without logging in, to cause a denial of service.
Read the original description
In Modem Firmware, there is a possible system crash due to improper input validation of dedicated PUCCH configuration. This could lead to remote denial of service with no additional execution privileges needed.
What to do
Workaround: The checked facts give no workaround and no fix. Watch the vendor's advisory for a patched modem firmware release.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Unisoc (Shanghai) Technologies Co., Ltd. Modem
UDX710
Evidence 2
- Link
- Link
Corrections
None so far.
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Questions about CVE-2026-79405
Is CVE-2026-79405 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The modem firmware does not properly validate a dedicated PUCCH configuration. A malformed value can crash the system, which causes a denial of service that the source describes as remote.Source: unisoc.com
Which versions are affected by CVE-2026-79405?
Modem: version UDX710.Source: cve.now feed data
Am I affected, and how do I check?
The source names Modem Firmware on the UDX710 chipset, and no firmware version ranges are listed. A reader can check the chipset of their device and the modem firmware version against the vendor's advisory.Source: unisoc.com
How do I fix CVE-2026-79405?
The checked facts name no fixed firmware version, so no upgrade target can be given. Check the Unisoc advisory for a patched modem firmware release.Source: unisoc.com
What if there's no patch?
The checked facts give no workaround and no fix. Watch the vendor's advisory for a patched modem firmware release.Source: unisoc.com