# CVE-2017-15710: Apache Software Foundation Apache HTTP Server

- Exploited (CISA KEV): no
- Published: 2018-03-26
- CVSS: not scored
- EPSS: 17.1% (97th percentile)

In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | Before feed history | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2023-08-08 | — |
| Akamai | No public source | — | — |
| OWASP CRS | Before feed history | — | — |

### F5

- 2023-08-08 · updated · rule 200011069
  > Updated: signature 200011069 "Apache mod_authnz_ldap Accept-Language Buffer Overflow" (Buffer Overflow, risk Medium), systems: Apache. References: CVE-2017-15710.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2023-09-12 · updated · rule 200011069
  > Updated: signature 200011069 "Apache mod_authnz_ldap Accept-Language Buffer Overflow" (Buffer Overflow, risk Medium), systems: Apache. References: CVE-2017-15710.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2017-15710 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2017-15710