In Modem, there is a possible out of bounds write due to a missing bounds check.
Affects MediaTek chipsets in the Modem component, including MT2716, MT2735, MT2737, MT6739 and MT6761. 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 list no workaround or mitigation. Until a fix is available, follow the guidance in MediaTek's bulletin or your device vendor's advisory.
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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? →
- 14/100 · 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: no
- Technical impact: total
Summary
The Modem component in affected mobile device chipsets can be exploited to write data outside its intended memory bounds, potentially allowing an attacker to gain elevated privileges on a device that connects to a malicious rogue base station. No user interaction is required for this to occur.
Read the original description
In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01874018 / MOLY01774038; Issue ID: MSV-9802.
What to do
Workaround: The checked facts list no workaround or mitigation. Until a fix is available, follow the guidance in MediaTek's bulletin or your device vendor's advisory.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- MediaTek, Inc. MediaTek chipset
MT2716, MT2735, MT2737, MT6739, MT6761, MT6762, MT6763, MT6765, MT6767, MT6768, MT6769, MT6771, MT6779, MT6781, MT6783, MT6785, MT6789, MT6813, MT6815, MT6833, MT6835, MT6853, MT6855, MT6858, MT6873, MT6875, MT6877, MT6878, MT6879, MT6880, and 47 more
Evidence 1
- Link
Corrections
None so far.
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Questions about CVE-2026-20547
What does this mean?
The Modem component can write data outside the memory area it should use. The cause is a missing bounds check, which is a check that stops writes past the end of a buffer.Source: mediatek.com
Am I affected, and how do I check?
The listed MediaTek chipsets are affected, including MT2716, MT2735, MT2737, MT6739 and MT6761. The checked facts give no version ranges, so compare the chipset model in your device's specifications with this list.Source: mediatek.com
What should I do about it?
The checked facts name no fixed version or upgrade target. Check MediaTek's security bulletin and your device vendor's update channel for a patch.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 list no workaround or mitigation. Until a fix is available, follow the guidance in MediaTek's bulletin or your device vendor's advisory.Source: mediatek.com