In ccci, there is a possible out of bounds write due to a missing bounds check.
Affects MediaTek chipsets MT2735, MT2737, MT6813, MT6880, MT6890, MT6980D, MT6982, MT6986, MT6988 and MT6990 in the ccci component.
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
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affected chipsets: MT2735, MT2737, MT6813, MT6880, MT6890, MT6980D, MT6982, MT6986, MT6988, MT6990 (ccci subcomponent)
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- 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? →
- 24/100 · 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? →
- Specific setups only
- 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: no
- Technical impact: partial
Summary
This vulnerability affects MediaTek chipsets and the ccci (cross-core communication interface) modem firmware used in their mobile and IoT platforms. A successful attack could crash the affected device's modem or cause a remote denial of service, though user interaction is required.
Read the original description
In ccci, there is a possible out of bounds write due to a missing bounds check. This could lead to remote denial of service with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS11523478 (Note: For MT6880, MT6890) / ALPS11297423 (Note: For MT6813, MT6986, MT6982, MT6980D) / AUTO00864897 (Note: For MT2735, MT2737); Issue ID: MSV-10724.
What to do
Check whether your setup matches what the bug needs.
Affected chipsets: MT2735, MT2737, MT6813, MT6880, MT6890, MT6980D, MT6982, MT6986, MT6988, MT6990 (ccci subcomponent)Workaround: The checked facts describe no workaround or way to limit the affected ccci component. Until a fix is available, no mitigation is documented in these facts.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- MediaTek, Inc. MediaTek chipset
MT2735, MT2737, MT6813, MT6880, MT6890, MT6980D, MT6982, MT6986, MT6988, MT6990
Evidence 1
- Link
Corrections
None so far.
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Questions about CVE-2026-20552
What does this mean?
The ccci component is missing a bounds check, so it can write outside the memory area it should stay within (an out-of-bounds write). The advisory does not describe any further consequences.Source: mediatek.com
Am I affected, and how do I check?
The advisory lists chipsets MT2735, MT2737, MT6813, MT6880, MT6890, MT6980D, MT6982, MT6986, MT6988 and MT6990 in the ccci subcomponent. The checked facts give no affected software versions, so check whether your device's chipset model is one of these.Source: mediatek.com
What should I do about it?
The checked facts name no fixed version or patch, so no upgrade target can be given. Check MediaTek's advisory for a fix for your chipset.Source: mediatek.com
Is it 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 if there's no patch?
The checked facts describe no workaround or way to limit the affected ccci component. Until a fix is available, no mitigation is documented in these facts.Source: mediatek.com