Vulnerability · CVE-2025-55127
HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users.
Published Nov 20, 2025 · catalog updated Nov 20, 2025 · Revive Revive Adserver
Last checked Oct 28, 2026. A connected source was read within the last 7 days.
Check this week
CVE-2025-55127 is not in CISA KEV. FIRST estimates a 25.00% chance of exploitation in the next 30 days. Check whether you run Revive Revive Adserver.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2025-55129 · Medium
- CVE-2025-48987 · Medium
- CVE-2025-48986 · High
- CVE-2025-52668 · High
- CVE-2025-52667 · Low
- Severity
- Medium5.4
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 25.00%
- Remediation
- Vendor / distro source
- Affected products
- vendor Revive Revive Adserver 6 ≤6.0.2
HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users. A username with leading or trailing whitespace could be virtually indistinguishable from its legitimate counterpart when the username is displayed in the UI, potentially leading to confusion.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Revive Revive Adserver 6 ≤6.0.26 ≤6.0.2
How to fix CVE-2025-55127
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 6 ≤6.0.2
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
CVE-2025-55127 is not in CISA KEV. FIRST estimates a 25.00% chance of exploitation in the next 30 days. Check whether you run Revive Revive Adserver.
Which versions are affected?
Compare what you have installed with Revive Revive Adserver 6 ≤6.0.2 6 ≤6.0.2. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 25.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Nov 20, 2025 · EUVD
Detected
HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users. A username with leading or trailing whitespace could be virtually indistinguishable from its legitimate counterpart when the username is displayed in the UI, potentially leading to confusion.
Nov 20, 2025 · EUVD
Updated
HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users. A username with leading or trailing whitespace could be virtually indistinguishable from its legitimate counterpart when the username is displayed in the UI, potentially leading to confusion.
Sources
- CVE.orgVulnerability recordCVE-2025-55127
Official CVE identifier
cve.org - EUVDVulnerability recordEUVD-2025-198344
HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users. A username with leading or trailing whitespace could be virtually indistinguishable from its legitimate counterpart when the username
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 20, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- CVE.orgOct 28, 2026
- EUVDOct 28, 2026