CVE-2021-27577 json
Incorrect handling of url fragment leads to cache poisoning
published 2021-06-29 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14326
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.4%
- EPSS 3.4% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.
Patch / fix
- trafficserver Debian 12 8.1.1+ds-1.1
debian advisories DEBIAN-CVE-2021-27577
Exploit prediction
3.45% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- Apache Software Foundation Apache Traffic Server
Classification
- Weakness
-
- CWE-444 Inconsistent Interpretation of HTTP Requests
References
-
debian.org
/security/2021/dsa-4957
vendor-advisory, third-party-advisory
-
lists.apache.org
/thread.html/ra1a41ff92a70d25bf576d7da2590575e8ff430393a3f4a0c34de4277%40%3Cusers.trafficserver.apache.org%3E
mailing-list, vendor-advisory
Sources
- CVE List CVE-2021-27577
- NVD CVE-2021-27577
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.