How severe is CVE-2009-4496?

CVE-2009-4496 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-4496 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4496?

CVE-2009-4496 affects Boa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4496?

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

When was CVE-2009-4496 published?

CVE-2009-4496 was published on 2010-01-13 and last updated on 2026-06-16.

CVE-2009-4496

CVE-2009-4496 is a medium-severity vulnerability in Boa with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Boa
Published: 2010-01-13
Last modified: 2026-06-16

Description

Boa 0.94.14rc21 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Frequently asked questions

What is CVE-2009-4496?: Boa 0.94.14rc21 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.
How severe is CVE-2009-4496?: CVE-2009-4496 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-4496 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4496?: CVE-2009-4496 affects Boa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-4496?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4496 published?: CVE-2009-4496 was published on 2010-01-13 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:boa:boa:0.94.14rc21:*:*:*:*:*:*:*

More vulnerabilities in Boa

CVE-2022-44117 — Critical (CVSS 9.8): Boa 0.94.14rc21 is vulnerable to SQL Injection via username. NOTE: the is disputed by multiple third parties because…
CVE-2018-21027 — Critical (CVSS 9.8): Boa through 0.94.14rc21 allows remote attackers to trigger an out-of-memory (OOM) condition because malloc is…
CVE-2021-33558 — High (CVSS 7.5): Boa 0.94.13 allows remote attackers to obtain sensitive information via a misconfiguration involving backup.html,…
CVE-2018-21028 — High (CVSS 7.5): Boa through 0.94.14rc21 allows remote attackers to trigger a memory leak because of missing calls to the free function.
CVE-2017-9833 — High (CVSS 7.5): /cgi-bin/wapopen in Boa 0.94.14rc21 allows the injection of "../.." using the FILECAMERA variable (sent by GET) to read…
CVE-2016-9564 — High (CVSS 7.5): Buffer overflow in send_redirect() in Boa Webserver 0.92r allows remote attackers to DoS via an HTTP GET request…

All CVEs affecting Boa →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →