How severe is CVE-2021-29996?

CVE-2021-29996 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-29996 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29996?

CVE-2021-29996 affects Marktext. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29996?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-29996 published?

CVE-2021-29996 was published on 2021-04-05 and last updated on 2026-06-17.

CVE-2021-29996

CVE-2021-29996 is a critical-severity vulnerability in Marktext with a CVSS 3.x base score of 9.6. 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-79.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 6.8
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Marktext
Published: 2021-04-05
Last modified: 2026-06-17

Description

Mark Text through 0.16.3 allows attackers arbitrary command execution. This could lead to Remote Code Execution (RCE) by opening .md files containing a mutation Cross Site Scripting (XSS) payload.

Frequently asked questions

What is CVE-2021-29996?: Mark Text through 0.16.3 allows attackers arbitrary command execution. This could lead to Remote Code Execution (RCE) by opening .md files containing a mutation Cross Site Scripting (XSS) payload.
How severe is CVE-2021-29996?: CVE-2021-29996 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-29996 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29996?: CVE-2021-29996 affects Marktext. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29996?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-29996 published?: CVE-2021-29996 was published on 2021-04-05 and last updated on 2026-06-17.

References

https://github.com/marktext/marktext/issues/2548

Affected products (1)

cpe:2.3:a:marktext:marktext:*:*:*:*:*:*:*:*

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CVE-2022-21158 — Medium (CVSS 5.4): A stored cross-site scripting vulnerability in marktext versions prior to v0.17.0 due to improper handling of the link…
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