How severe is CVE-2008-4821?

CVE-2008-4821 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2008-4821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4821?

CVE-2008-4821 primarily affects Adobe Flash Player. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-4821?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2008-4821 published?

CVE-2008-4821 was published on 2008-11-10 and last updated on 2026-06-16.

CVE-2008-4821

CVE-2008-4821 is a medium-severity vulnerability in Adobe Flash Player with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Adobe Flash Player
Published: 2008-11-10
Last modified: 2026-06-16

Description

Adobe Flash Player 9.0.124.0 and earlier, when a Mozilla browser is used, does not properly interpret jar: URLs, which allows attackers to obtain sensitive information via unknown vectors.

Frequently asked questions

What is CVE-2008-4821?: Adobe Flash Player 9.0.124.0 and earlier, when a Mozilla browser is used, does not properly interpret jar: URLs, which allows attackers to obtain sensitive information via unknown vectors.
How severe is CVE-2008-4821?: CVE-2008-4821 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2008-4821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4821?: CVE-2008-4821 primarily affects Adobe Flash Player. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-4821?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-4821 published?: CVE-2008-4821 was published on 2008-11-10 and last updated on 2026-06-16.

References

Affected products (20)

cpe:2.3:a:adobe:flash_player:*:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:7.0.69.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:8.0.39.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.16:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.16:*:windows:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.18d60:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.20:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.20.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.28:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.28.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.28.0:*:mac_os_x:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.31:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.31.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.45.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.47.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.48.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.112.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.114.0:*:*:*:*:*:*:*
cpe:2.3:a:adobe:flash_player:9.0.115.0:*:*:*:*:*:*:*

More vulnerabilities in Adobe Flash Player

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CVE-2015-8452 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Flash Player before 18.0.0.268 and 19.x and 20.x before 20.0.0.228 on Windows and…
CVE-2015-8451 — Critical (CVSS 10.0): Adobe Flash Player before 18.0.0.268 and 19.x and 20.x before 20.0.0.228 on Windows and OS X and before 11.2.202.554 on…

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