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By Thomas Westerholm
Life & Trends Reporter
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Samsung's Galaxy S21 smartphone series appears to have reached the end of its software support window, raising security concerns for millions of users still relying on the popular 2021 flagship lineup.
With the January 2026 patch likely being its final update, the devices are no longer guaranteed protection against newly discovered threats.
The Galaxy S21, S21+ and S21 Ultra were released in January 2021 with a promised five years of security updates.
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That window has now closed with the release of firmware G99xNKSSCHZA5, which brings the January 2026 security patch addressing 55 known vulnerabilities.
Samsung has not formally announced the end of support.
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Why It Matters
Losing software support means that Galaxy S21 owners will not receive future patches for critical vulnerabilities. Without regular updates, phones become more susceptible to malware, hacking attempts and compromised applications.
As one of Samsung’s best-selling models, the Galaxy S21 series remains widely used. The lack of protection could pose a broader cybersecurity issue across the Android ecosystem.
Security updates play a key role in safeguarding mobile users against escalating online threats. With banking apps, password managers and two-factor authentication increasingly common on smartphones, unsupported devices present a growing risk.
What To Know
While the S21 models are still technically operational, Samsung may remove them from its quarterly update list in February, officially concluding all support.
Users who continue using the device beyond that point will do so without the safety net of guaranteed software maintenance.
Samsung’s newer flagships, such as the Galaxy S25 and upcoming Galaxy S26, offer up to seven years of software support.
Trade-in values for the Galaxy S21 are currently modest, around $100 for a base model toward a new Galaxy S25 Ultra but are expected to decline further once the S26 is released.
What's Next
Samsung is expected to unveil the Galaxy S26 series in the coming weeks, offering users an opportunity to upgrade to a supported device with long-term update guarantees.
For users considering a switch, Samsung’s foldable phones—such as the Z Fold 7 and Z Flip 7—are also candidates with full software support. Mid-range models like the Galaxy A57 are also expected to receive extended security updates.
Users opting to keep their Galaxy S21 devices may still find basic performance intact, but will need to weigh the risks of operating without ongoing security protection.
Newsweek has attempted to reach Samsung for comment via the company's website.
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