How severe is CVE-2018-16979?

CVE-2018-16979 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-16979 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-16979?

CVE-2018-16979 affects Monstra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-16979?

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

When was CVE-2018-16979 published?

CVE-2018-16979 was published on 2018-09-12 and last updated on 2026-06-17.

CVE-2018-16979

CVE-2018-16979 is a medium-severity vulnerability in Monstra with a CVSS 3.x base score of 6.1. 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-113.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 5.8
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-113
Affected product: Monstra
Published: 2018-09-12
Last modified: 2026-06-17

Description

Monstra CMS V3.0.4 allows HTTP header injection in the plugins/captcha/crypt/cryptographp.php cfg parameter, a related issue to CVE-2012-2943.

Frequently asked questions

What is CVE-2018-16979?: Monstra CMS V3.0.4 allows HTTP header injection in the plugins/captcha/crypt/cryptographp.php cfg parameter, a related issue to CVE-2012-2943.
How severe is CVE-2018-16979?: CVE-2018-16979 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-16979 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-16979?: CVE-2018-16979 affects Monstra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-16979?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-16979 published?: CVE-2018-16979 was published on 2018-09-12 and last updated on 2026-06-17.

References

https://github.com/howchen/howchen/issues/4

Affected products (1)

cpe:2.3:a:monstra:monstra:3.0.4:*:*:*:*:*:*:*

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